Co-Creation Approach in Designing a Sustainable Coffee Supply Chain (a Case in Bandung Regency, West Java, Indonesia)

Agricultural development in Indonesia had been conducted in a top-down manner since its independence, which has limited its effectiveness due to the gap between the reality faced by the development actors and actors who are involved in the agricultural supply chain. This paper provides evidence of a more participative model design by involving most of the actors in its process. The study was performed in action research by using a co-creation approach, involving actors who contributed their thoughts in designing the most suitable model that can support them in reaching a more sustainable supply chain for coffee agribusiness in Bandung Regency, West Java, Indonesia. The results show that a co-creation approach has managed to improve the performance of the coffee supply chain by the formation of a cooperative, which enhanced coordination among stakeholders. Furthermore, the involvement of farmers provided significant contributions in the design of the model.


Introduction
Indonesia has always been within the top three world's coffee producing countries for around three decades [1]. Previous studies of growth trend analysis for coffee consumption in Indonesia showed an average increase rate of 8.66% during the 2016-2020 period [2]. This showed that national consumption for coffee in Indonesia is growing in line with the growth of the population.
The increase for coffee demand in both global and national markets is responded by an increase in coffee production through land expansion, which is also shown in the data for coffee plantation, which has increased with the average annual growth rate of 3% within the last 5 years [3]. The improvement was made possible by various government's programs. However, as other agricultural development programs, these improvements were carried out in a top-down manner, placing less attention on its impact to farmers' welfare [4]. The government aggressively encouraged farmers to increase their production by providing them with aids in form of physical means of production (seeds, fertilizers, and farming tools), placing less attention to the potential value added of the commodity, that can be gained by the farmers.
Ensuring agricultural development's success is crucial in developing rural areas in Indonesia, which in the end will contribute to the country's overall economic stability. Since the day of its independence, the Indonesian agricultural sector has been directed to fulfill the nation's ever-growing demand for food. Thus, the efforts of agricultural development have been focused on increasing production levels by land expansion and farm intensification [5,6]. However, the top-down manner of agricultural development started from the Soeharto regime in early 1970s and the remains until the present day. It had been successful in securing the nation's food security and developing its agriculture [6][7][8]. Unfortunately, it also brought negative side effects, which often place farmers in a more difficult situation [9][10][11][12][13].
In the case of coffee, the farmers have more room for maneuver. That is to say that the commodity has high value potential, which allows farmers to gain more profit by performing simple and inexpensive processing activities. Nevertheless, the current supply chain, which is long and complex, limits their opportunities to perform that. Previous studies showed that this traditional supply chain has amplified rivalry to the disadvantage of smallholder farmers [14,15]. Long chain supply chain made it difficult for farmers to gain more value, since most of the values are distributed to other actors. This has reduced the sustainability of Indonesian coffee's supply chain by posing risks that may affect the economic, environmental, and social aspect [16].
In order to transform the long supply chain that is considered to limit farmers' ability to grow, the involvement of a government who can facilitate transformation through policies is required. This study aims to generate a system that enables the coffee supply chain in Bandung Regency to be more sustainable. The model will be generated by using co-creation approach through action research process. This was conducted to ensure the participatory process in its formulation and so that it can accommodate not only a fairer value distribution but also the arrangement of rights and obligations among the involved actors.

Sustainable Food Supply Chain
Various studies have shown the coherence of sustainability and supply chain. The supply chain involves several actors conducting product creation and/or delivery activities from the producer to consumer. Carter and Rogers [17] suggested the wide implementation of supply chain and coordination of sustainability due to the supply chain actors' focal position that linked them to producers and customers via products and services. These actors' practices are influenced by customers, governments, and other internal and external stakeholders such as non-governmental organization [18].
Sustainability in a supply chain includes economic, social, and environmental elements [19]. However, experts in the French National Network on Local Food added health/nutrition and governance aspects to the system [20]. Chiffoleau then summarized the categorization as follows: The economic element includes farmers' income, jobs creation, farmers' workload, and contribution to the local economy; the social element includes social relations, collective actions and social innovations, accessibility to low-budget consumers, and value of women's work; the environmental element includes Green House Gas emissions, agrobiodiversity, and environmentally friendly practices; the health/nutrition element includes nutritious and healthy food; and the governance element covers the balance of power relations in the food chain and the participation of the citizen in the food chain.

Short Food Supply Chain for Sustainable Development
Food supply chain's sustainability is a topic producers, consumers, suppliers, researchers, and policy makers are increasingly interested in. Currently, the advancement of various food chains has attracted increasing attention, with new governance starting to fill gaps left by conservative regulations and with increasing public concern over the source and handling of foods. This concern is also confirmed by the substantial progress of short food supply chain (SFSC) initiatives as an alternative to globalised food chains [21]. Logistics is one of the focal weak points which dynamically contributes to altering Short Food Supply Chain (SFSC) into a concrete and sustainable alternative to the globalised food system [22,23]. SFSC is mostly characterised by its geographical nearness, which is the closeness between producers and consumers [24,25]. This closeness can be conceptualised in relation to distance [26,27], in time [28], or in terms of political boundaries such as regions [28,29]. However, the distance between producers and consumers is not explicitly defined, but it is a function of the morphological and demographical structures of a region as well as of actors involved and their purposes [21]. Marsden et al. [30] emphasised upon the type of connections between producers and the consumers in these supply chains and the role of this connection in creating value and meaning rather than the type of the product itself.
SFSC is grounded on the shortest exchange between farmers and consumers and their subsequent relationships based on trust [21]. SFSC is categorized by insignificant number/absence of intermediaries [31,32]. The chain and any possible intermediates must deliver a means of communication between farmers and customers: farmers can supply consumers with information and obtain their feedbacks in return [33].
SFSC provides opportunities for changing the production of food products from its 'industrial mode' and can construct supply chains that can potentially cut the long, complex, and reasonably prearranged industrial chains within which a diminishing part of total added value in food production is gained by primary producers [30].

Co-Creation in Public Policy
Co-creation is defined as the participation of citizens in the commencement and/or design of public services to bring positive outcomes [34]. In co-creation initiatives, citizens are considered as important and equal partners who have specific resources and capabilities which are valuable for (re)designing public service delivery [35] (see the works of Alford [36], and Parrado et al. [37] for examples). At present, there is a cumulative trend to include citizens in policy-making processes by government officials and politicians as a mean to reduce the unintended outcomes that can potentially carry risks to the community whenever new policies are being applied. Citizens are provided with the chance to be involved in the cooperative framing of what related services and service outcomes are and how they should be planned [35].
In the literature, there are three types of co-creation based on the degree of citizen's involvement in the process. The first one involves citizen as co-implementer, where the citizen only participate in the implementation of an initiative (see [38]); the second involves citizens as co-designer, where the citizens were actively involved in the design process of service delivery (see [39]); and the third encompasses citizens as an initiator and public officials as following actor (see [40]).
This study employs the second type of co-creation where the government took the initiative, while the citizens, which in this case comprise farmers, traders, and processing companies, were actively participating in the design of initiatives and its deliveries.

Materials and Methods
Bandung regency is one of the coffee producing areas in Indonesia where quality beans are grown. It is located in West Java province, approximately 1000 m above sea level at the foot of mountain areas that surround Bandung city ( Figure 1). These geographical characteristics have made the Bandung regency very suitable for growing high quality coffee beans, which is dominated by an arabica variety. This has affected farmers by providing them the opportunity to maximize their profit through value-added activity. Arabica coffee is known for its unique organoleptic characteristics, which is determined by its growing location's agroecosystem.
There are 26 districts in Bandung regency which are potentially feasible for coffee growing activities: Pangalengan, Paseh, Ibun, Kertasari, Rancabali, Pacet, Pasirjambu, Ciwidey, Cikancung, Cileunyi, and Cilengkrang. These districts are located within 6 mountains that surround Bandung City: Mount Tilu, Mount Malabar, Mount Patuha, Mount Manglayang, and Mount Wayang. Within this region, there are 40 farmer groups consisting of 2830 members. However, as we visited the groups, not all groups and all of the members in the list are still active. Thus, we only selected 20 groups. Within each group, we stratified farmers based on their owned land size and categorised them into 3 categories: small farmers (less than 1 ha), medium farmers (1-3 ha), and large farmers (more than 3 ha). Then, we randomly selected 12 farmers from each group (4 per category) in order to select a total of 240 respondents for the survey phase of this study. Moreover, we also included 25 middlemen (traders), 10 processors/roasteries, and 5 retailers who were willing to participate in this study. Middlemen are those who purchase cherries from the farmers, and some perform primary processing activities to process cherries into green beans. Processors/roasteries are those who perform the roasting process to turn green beans into roasted beans. Retailers are those who sell the roasted beans directly to consumers.
Prior to the workshop, in-depth interviews and focus group discussion (FGD) were conducted with key informants representing actors involved in coffee supply chain (heads of farmers' group, traders, roasteries, and retailers) and policy makers. This was conducted to identify their motives, to build trust, and to create common grounds among them. In the FGD, we also identify what actors think about the current supply chain performance and its impacts on their business.
After the FGD, structured interviews were conducted for selected respondents. Questionnaires were given to the respondents in order to ask them about their perspectives toward the current supply chain performance. We asked closed questions such as 'what do you think of the overall supply chain performance?' and provided options for answers, such as the following: (1) Satisfied, (2) neutral, and (3) not satisfied.
The results were then discussed in workshops involving representations of the actors, who also participated in the FGD. During the workshop we searched for further information on more specific reasonings behind the results of the survey (e.g., why are most farmers are unsatisfied? On what aspects?). The information was also triangulated by indepth interviews with the key informants, which was conducted in between workshops.
The second workshop was carried out to gather ideas from key informants that can contribute to model construction. Then, the last phase was to clarify the constructed model to key informants. Within this region, there are 40 farmer groups consisting of 2830 members. However, as we visited the groups, not all groups and all of the members in the list are still active. Thus, we only selected 20 groups. Within each group, we stratified farmers based on their owned land size and categorised them into 3 categories: small farmers (less than 1 ha), medium farmers (1-3 ha), and large farmers (more than 3 ha). Then, we randomly selected 12 farmers from each group (4 per category) in order to select a total of 240 respondents for the survey phase of this study. Moreover, we also included 25 middlemen (traders), 10 processors/roasteries, and 5 retailers who were willing to participate in this study. Middlemen are those who purchase cherries from the farmers, and some perform primary processing activities to process cherries into green beans. Processors/roasteries are those who perform the roasting process to turn green beans into roasted beans. Retailers are those who sell the roasted beans directly to consumers.

The Action Research Process
Prior to the workshop, in-depth interviews and focus group discussion (FGD) were conducted with key informants representing actors involved in coffee supply chain (heads of farmers' group, traders, roasteries, and retailers) and policy makers. This was conducted to identify their motives, to build trust, and to create common grounds among them. In the FGD, we also identify what actors think about the current supply chain performance and its impacts on their business.
After the FGD, structured interviews were conducted for selected respondents. Questionnaires were given to the respondents in order to ask them about their perspectives toward the current supply chain performance. We asked closed questions such as 'what do you think of the overall supply chain performance?' and provided options for answers, such as the following: (1) Satisfied, (2) neutral, and (3) not satisfied.
The results were then discussed in workshops involving representations of the actors, who also participated in the FGD. During the workshop we searched for further information on more specific reasonings behind the results of the survey (e.g., why are most farmers are unsatisfied? On what aspects?). The information was also triangulated by in-depth interviews with the key informants, which was conducted in between workshops.
The second workshop was carried out to gather ideas from key informants that can contribute to model construction. Then, the last phase was to clarify the constructed model to key informants.

The Action Research Process
Reason and Bradbury [41] defines action research as an "orientation to inquiry". The main elements of that positioning are that participants are involved and treated equally and that the knowledge produced is practical. Thus, action research is collaborative [42]. However, the complexity of human systems also demands flexibility [43]. This flexibility can be provided from the basis which the action research uses. Dick et al. [43] stated that there are currently two elements of this process that support it to function as a flexible meta methodology: the iterative cycles and the nested cycles.
The capacity of the iterative cycles to be nested has not been studied much yet, although it is probably common in practice [43]. Nested cycles have been defined as a features of software development plans (e.g., [44]).
This stage is performed often in action research projects. Lewin [45] defines this practice as 'a spiral of steps, each of which is composed of a circle of planning, action, and fact-finding about the result of the action'. There are at least five-element cycle: diagnosing, action planning, action taking, evaluating, and specifying learning [46]. Mctaggart [47] redeveloped the elements to plan, act, observe, and reflect, although in later studies they have displaced this cycle from its central position.
This process is also found in other fields, such as continuous improvement (e.g., [48]), evaluation (e.g., [49]), and experiential learning (e.g., [50]). These are amplifications of a basic cycle that substitute between action and the review of that action. This cycle is important as it allows trial and error to be informed by experience.
Based on those theoretical frameworks, we conducted action research together with the actors by using focus group discussions, workshops, survey, and in-depth interviews. The summary of our action research process can be seen in Table 1.

Scenario-based workshops
In small groups (two for each group) participants considered a likely near-future scenario as realistic and challenging for identify required solutions To collect more information To triangulate with data from pilot study and the components of the main study To collect data on differences between their supply chain, and other cases To augment the first survey

Framework check
As part of each scenario-based workshop (above), participants were asked to comment on the adequacy, usefulness, and completeness of the framework developed in the pilot study To further refine the framework. To test it against the perceptions of managers from the industry partners after they had been reflecting on required capabilities

Results
This section starts by providing information gained from the informants for the existing supply chain, including their perspectives towards the performance of the chain and their perceived problematic situations. This section closes with a discussion of generated ideas and policies as results of the action research process.

Existing Coffee Supply Chain
In today's coffee supply chain, most farmers sell cherry (coffee fruit), limiting their possibility to gain more value from their product. They sell cherry to the middlemen, who will then sell them to processing units in the village level. The cherry will be processed to produce green bean (raw coffee bean ready for roasting), to be sold to other processing units who have expertise in coffee roasting (roastery). From the roastery, the roasted beans will be sold to horeca (hotels, restaurants, and cafés), coffee retailers, or directly to consumers. Based on our findings, through this kind of supply chain, the farmers only gain 22% of the total value added, while the rest of the value goes to other actors. This is worsened by the fact that farmers only gain this value in certain period of time, since they really depend on the seasonality of the plant. While other actors gain their value in more frequent periods, most of them having a daily cycle. Along with the continuously increasing production costs at the farmer's level, this situation poses a threat to the existence of coffee farmers in the future.
Most coffee farmers in Bandung Regency are focused only on the production of cherries (coffee fruits), leaving them with only a small portion of value from the coffee business. In order to produce 1 kg of cherry, they have to spend approximately 4500 IDR (0.3 USD), which includes all production costs (plant maintenance and harvesting). The cherry is then sold with various selling price ranging from 3000 IDR to 10,000 IDR (0.15-0.70 USD) per kg, depending on the market situation. This condition illustrates the fragile position of coffee farmers, as they have to confront price volatility. Sure, they can gain high profit when the selling price is at its highest, but according to in-depth interview results, this situation occurs very rarely, not even once in a year. On the other hand, the production costs are almost fixed and continue to increase periodically. This means that the farmers have to deal with more pressure when they face the lowest selling price point. As most of the farmers rely solely on coffee plantations for their livelihood, they sometimes see that there is no future for them to stay in the coffee production, which means that it poses a threat to the sustainability of the coffee agroindustry as a whole.
Based on the survey, here are the perspective of actors toward the current coffee supply chain in Bandung Regency.
From the Table 2, we can observe that most of farmers are not satisfied with current supply chain performance (50-75%). Based on the following workshop, discussion, and in-depth interviews with the farmers, we learned that the most common reason was due to their low bargaining position, which limits their capability in gaining more value from their product. One of the farmer group leaders shared his point of view: 'We are stuck in this situation, we know that the beans sell more than the cherries, but we do not know the standard quality of the beans asked by the market, we do not have the access to the technology, also most of us have no opportunity to do that because we have a deal with the middlemen even before the fruits are ready to be harvested'. Y (43), This applies for all farmers, especially small and medium-scale farmers who own less than 3 ha of coffee area. This situation also shows the exclusion of the farmers from the supply chain. By only selling coffee fruit (cherries), the farmers' interaction with the market is limited; thus, their access to information and knowledge regarding the market situation is also partial.
Middlemen/traders are mostly satisfied (60%) and have no objection (28%) with the current supply chain performance, as they perform less work and gain more value in general. Based on the following workshop and in-depth interviews with them, we learned that while they seem to gain less value per kilogram compared to the farmers, they conduct their business daily, resulting in faster cashflow and capital accumulation. They also have less risks as they do not have to face the risks that are being faced by the farmers (for example, uncertainty of the nature that determines product quality and productivity). It might seem that they have to face risks occurring at the market level (such as price volatility), but in practice, they bring back these risks to the farmers. When the market price drop, they use this information to justify their position so that they can buy cherries at a lower price from the farmers. The unsatisfied middlemen are mostly small-scale traders who are new to the business, which hinders them in penetrating the existing structure of the chain. These middlemen found it hard to build trust and commitment from the farmers as their source of supply, as most farmers have already made some arrangements with other traders who can provide more advantage to the farmers (e.g., by providing loans, agro-input, etc.). Some processors/roasteries are satisfied (40%) and neutral (20%) with the current chain, but this only applies to those who have an arrangement with the traders/middlemen, ensuring raw materials that they need to conduct their business. However, there are 40% of processors who are not satisfied. Based on the workshop and in-depth interviews with the processor, we found that this was due to unstandardised green beans quality and the uncertainty of supply brought by random middlemen without any contract/arrangement. 'Up to this day, it is hard for us to maintain the quality of our product, and our ability to meet the market demand. It is hard for us to make contract with our suppliers because we received green beans from different traders all the time. This affects our business and made it hard for us to expand'. JN (35), As for the retailers, most of them are satisfied (60%) and neutral (20%). Based on the workshop and in-depth interviews with the processor, we learned that this was due to their high bargaining position in the chain. They have many options to select which products are worth selling. If there are suppliers who cannot meet their standards, they can simply pick another supplier. However, this only applies for those who are already in the business for some time. As for newcomers, they feel unsatisfied (20%) with the current supply chain due to their limited networks and information.
These first three phases of the study were not only able to encourage actors to identify their own problems but also to observe their position in the bigger picture by acknowledging that other actors have problems too. The results of the in-depth interviews and the first workshop are summarized in Table 3 below.
From the results of the survey and the first workshop, the participants agreed and concluded that the most urgent root of the problem in their current supply chain is the relationship between farmers and the middlemen. Most farmers complained about their dependency on middlemen. Increasing production costs combined with the volatile (often low) selling price of cherry limits the farmers' capital capacity to enter the next farming cycle. This situation is usually addressed by having a deal with middlemen. The middlemen provide certain credits for the farmers with some arrangements, which often place farmers in a difficult situation. For example, the middlemen agreed to give loans to the farmers, as long as the farmers are willing to sell their product to them with a lower price, Not to mention the interests which further burdened farmers. This situation affected both production and supply levels of the system, which then results in problems faced by processors and retailers. Currently, the processors and retailers complained about the continuity of the product (both for quality and quantity), which is determined by how well the farmers organize their farm, while the performance of the farmers itself is limited due to their unhealthy relationship with the middlemen. Thus, the participants agreed that we should focus on fixing this problem first before moving to other areas. Consequently, the next action research activities were focus in creating the most plausible solutions for the problems, especially based on the relationship between farmers and traders.
Some of those problems are actually being addressed in the current policy, especially regarding production. However, the fact that farmers still brought those up during discussions showed that those problems still exist. Most of the current policies only focus on improving the farmers' capacity through training and providing aid (usually in the form of agro-input, e.g., seeds, fertilizers, and pesticides). Nevertheless, those efforts only managed to bring temporary changes that last only for a short period of time.
The second workshop then pursued the solutions for the identified problems, where both parties (farmers and traders) discussed solutions that suits them best. In this workshop, government officials and academicians acted as referees to provide advice and suggestions for farmers and traders. In addition, the referees also have to make sure that the generated solutions do not provide more advantage for one party while negatively affecting the other.
According to the conclusion of the first workshop, the participants agreed that the second workshop should be more focused on the involvement of farmers and traders. We experienced that the discussions were a little bit heated as they tried to negotiate a solution for the seemingly unfair trade network, which requires traders to be willing to provide some of their profit opportunities to the farmers. However, the workshop managed to generate solutions with feasible implementation (Table 4).

The Role of the State
The government, with the help from academicians who are involved in this research, plays an important role in leading and facilitating the co-creation process. The authorities that they have over the actors involved in the supply chain made it possible for them to gain control. However, at this stage, we also found that government institutions have their own problems in regulating the coffee supply chain. Their main problem was due to the complexity of rules and regulations in which they can operate.
Bandung Regency's Agricultural Services is more focused on production elements, while trading elements are under Trading Services. Both institutions work under different ministries, i.e., the Ministry of Agriculture and the Ministry of Trade. They are both tied to different goals and roles.
State and governance traditions can be defined as sets of institutional and cultural practices that constitute a set of expectations about behaviours [51]. The co-creation successful rate is determined by authorities, since they are the one who have the power to manage relationships among actors. Whether co-creation will be allowed to be a game changer is dependent on state and governance traditions already in place [52].
In this study, the government took part in facilitating the arrangements between the traders and the farmers, which regulates their rights and duties in the cooperative. The summary of the agreed arrangements can be seen in Table 5.

Discussion
Sustainability in a supply chain includes economic, social, and environmental elements [19]. Those three elements should be equally important and be taken into account in supporting policies of coffee development. However, in this case, the root of the problems seems to be focused in the social aspect of the supply chain. The existing long and complex chain limits farmers' ability to gain more profit, further impacting the restriction of their potential to grow. This situation threatens other actors as farmers are the main actors who produce raw materials which allow other businesses along the chain to run.
In the case of coffee in Bandung Regency, we can observe that the farmers are the ones who suffered the most. This study suggested that they have to be more involved in the chain so that they can gain more bargaining positions in making arrangements with other actors. To perform this, they have to organize themselves in conducting their activities collectively, and they also have to divide roles among themselves.
Although many other studies suggested that the term of SFSC refers to the exclusion of some actors from the chain [15,21,23,31,[53][54][55][56], our findings showed a different perspective. We have to understand that each actor involved in the supply chain has their own motives and needs. In addition, they also play roles that make it possible for the chain to work. Thus, the relativity of their roles and motives in the chain should be the subject for developing a more sustainable supply chain. The action research resulted in the formation of a cooperative which can represent the farmers without excluding traders. The actors understood that no matter how negative middlemen presence is perceived by most people, they play an important role; moreover, they also have families to feed. Thus, we decided to include them into the cooperative and allow them to perform their usual roles in a more organized and transparent manner.
Co-creation in social innovation involves the creation of long-lasting outcomes [57,58] which aim, through a process of participation and collaboration, to address societal needs by fundamentally changing relationships [59], positions, and rules between involved stakeholders [34]. Social innovation is relatively autonomous but interdependent, and actors try to shape the content and results of policy programs [60]. Therefore, the actors become 'co-creators' and are expected to deliver valuable input to the development of a public service [61].

Conclusions
Short-circuiting the long, complex, and often unfair agricultural supply chain will always be an ongoing process. The heterogeneity of actors involved in the supply chain, each with their own motives and background, make it difficult to look at it with a simplistic point of view. Thus, the term 'short-circuiting' has to be further discussed. Transforming the long supply chain into a shorter one does not necessarily mean that we have to cut one or two parts of the chain, as it would also entail cutting someone's livelihood, which will result in increased problematic situations.
Based on our action research, the participants came up with the idea that embraced more collaboration than competition and inclusion over exclusion. Hopefully, accommodating everyone's needs and expectations and encouraging mutual understanding among actors will result in a more sustainable supply chain in the future. However, the sustainability of the initiative itself needs to be ensured by involving supporting actors who have authority and knowledge and who can act as a referee to help actors in dealing with unwanted conflicts or situations, which is always a possibility in the future.
The co-creation approach allowed the participation of actors in the policy-making process, which, in this case, is manifested through the initiation of the cooperative. This process shows potential for the actors to grow from within, which will be the seed for endogenous development in the future. As in its current state, the initiatives have just started, and we observe that as a step toward a more sustainable coffee supply chain. Prior to initiatives, the supply chain was still in a traditional, long, and complex state. After the initiative, most actors agreed to work together under the cooperative. However, it is too early to judge if the newly implemented SFSC works better than the previous one. Further research should be carried out to measure the success of initiatives in the future. There are still some room for improvements. Based on our experience, unfortunately in our case, the co-creation approach was not able to improve coordination among policy makers. The complexity of government institutions lies in an unreachable area for us, which requires higher-level intervention.
Funding: This research received no external funding.

Institutional Review Board Statement:
This study involves humans not as patients, but as participants and/or respondents to brainstorm and to gain their insights. This study is also unrelated to health studies. Thus, the ethical review and approval were not applicable for this study.

Informed Consent Statement: Not applicable.
Data Availability Statement: This study does not report any data.