Abstract
Inflation generates stress, which may lead to high rates of anxiety and depression. Given the recent surge and subsequent decline in the inflation rate in the United States, the prevalence of stress due to inflation may vary, as well as its relationship with anxiety and depression. Therefore, we investigated the prevalence of stress due to inflation and its association with anxiety and depression over time among working-age adults in the United States. We conducted a repeated cross-sectional analysis using Household Pulse Survey (HPS) data for the following weeks: Week 50 (5–17 October 2022) and Week 57 (26 April–8 May 2023). The HPS includes questions about individuals’ stress levels due to price increases in the past two months. We used logistic regressions to examine the association of stress (moderate or high stress versus little or no stress) due to inflation with depression and anxiety among working-age adults controlling for several factors, including demographic factors and social determinants of health. From October 2022 to April–May 2023, the prevalence of stress due to inflation affected more than three quarters of the population (77.7% and 78.7%, respectively). In logistic regressions, we found a significant positive association of stress due to inflation with depression (adjusted odds ratio (AOR) [95% CI] = 2.22 [1.92, 2.57]) and anxiety (AOR [95% CI] = 2.50 [2.18, 2.86]). Despite a decline in the prevalence of both depression and anxiety by three percentage points over the study period, the associations between stress, due to inflation on the one hand, and anxiety and depression, on the other, persisted over time. Stress due to inflation affects more than three-quarters of Americans, and is significantly associated with depression and anxiety. Stress due to inflation is a significant and persistent public health issue.
1. Introduction
Prior to the COVID-19 pandemic, inflation, a key economic indicator to measure purchasing power, had remained low (under 5%) in the United States (US) for nearly 40 years, except for a brief period around 1990 [1]. However, during the pandemic, it steadily increased, with a substantial negative impact on the economy, individuals, and families. It is well established that, as inflation increases, the costs of essential expenditures tend to surpass income growth, leading to higher financial demands and diminished purchasing power [2]. For example, what could be purchased with $100 in 2019 required approximately $115 by 2022 [3]. Such a loss in purchasing power can exacerbate financial hardships, as well as stress, for many households already affected by COVID-19 [4]. Indeed, a high prevalence of stress due to inflation has been reported in newspaper reports and in recent articles using data from the Census Household Pulse Survey (HPS) [5,6,7,8].
Furthermore, prolonged stress can lead to poor mental health [9]. Researchers have investigated the impact of stress, specifically financial stress, on mental health, albeit under different circumstances. For example, financial worries have been found to be associated with higher levels of psychological distress [10]. A systematic review reported that financial stress was associated with an increased risk of depressive symptoms among adults [11]. While the impact of economic instability on mental health has been extensively studied [12], the association of stress due to inflation and mental health, specifically anxiety and depression, has remained unexplored. There has been some evidence of the association of stress due to inflation with poor mental health in blogs, newspaper articles, and other reports [13,14,15,16].
However, to our knowledge, only one scientific study [7] has considered the relationship between inflation and mental health with a focus on how hardships due to inflation, in other words coping behaviors, such as purchasing less food or delaying medical treatment, are associated with psychological distress. This paper extends this research by considering how self-reported stress due to inflation, irrespective of whether any hardships are experienced, correlates with anxiety and depression.
It is important to examine the association of stress due to inflation with mental health, specifically anxiety, and depression, among working-age adults (18–64 years), because inflationary pressures may disproportionately affect this group due to multiple competing financial obligations, such as those for education, child-care, career investments, home purchases, or stagnant earnings [5]. In addition, working-age adults are probably witnessing the highest inflation of their lifetimes [17] and may not cope well with inflationary pressures.
Inflation is a macro-economic issue that affects the economic security of households. We frame the relationship between inflation and mental health through the biopsychosocial model of health [18]. We situate inflation as one of the social factors that contribute to the development of mental health problems, in addition to, and in interaction with, biological factors (genetics, brain chemistry) and psychological factors (thoughts, emotions, behaviors). Furthermore, we note that stress due to inflation is a potential mechanism whereby inflation may contribute to depression and anxiety. Using the framework by Baum et al (1999) [19], linking the experience of stress and health outcomes, the contribution of stress due to inflation to depression and anxiety is indirect and occurs through one or more of the following channels: (i) biological changes in endocrine and/or immune systems, (ii) behaviors that impact health (e.g. drinking, exercising), and (iii) changes in illness-related behavior (e.g. prevention-related behavior). Socioeconomic status (SES) factors can make the contribution of stress due to inflation to negative changes in behaviors and biological changes worse, for example among persons living in more deprived environments (e.g., communities with limited support structures), with more challenging social conditions (e.g., subject to discrimination), and with other SES factors that affect health, such as limited access to health care or quality nutrition (Baum et al 1999). We, therefore, hypothesize that stress due to inflation, as well as mental distress, will be more prevalent among individuals who are disadvantaged in terms of SES, such as persons who are poor, food insecure, have recently lost employment income, or do not have health insurance.
We analyzed the association of stress due to inflation with anxiety and depression using cross-sectional data from two time periods (October 2022 and May 2023) of the US Census Bureau HPS. We selected a repeated cross-sectional analysis approach, as there has been a decline in general inflation in recent months, and this may have affected stress levels and their relationships with anxiety and depression. Although one can expect reports about a decline in the general inflation rate in the US to lead to lower rates of stress, food and housing prices have not declined at the same rate as general inflation (Figure 1). The persistent higher food and housing prices compared to pre-COVID-19 negatively affects households and families’ everyday lives. Such ongoing economic hardship without corresponding wage increases can lead to a continued, or even elevated, prevalence of stress over time. With the recent surge and subsequent decline in the inflation rate in the US, there could be significant changes in the prevalence of inflation-related stress and its association with mental health. Therefore, the primary objective of this study is to investigate the prevalence of stress due to inflation during the declining inflation period, and the varying associations of stress due to inflation with anxiety and depression over time among working-age adults in the US.
Figure 1.
The 12-month percentage change in the Consumer Price Index, all items and food. Source: US Bureau of Labor, https://www.bls.gov/charts/consumer-price-index/consumer-price-index-by-category-line-chart.htm (accessed on 2 May 2023).
2. Materials and Methods
2.1. Study Design
We conducted a pooled cross-sectional analysis of data from the online Household Pulse Survey (HPS), collected during two time periods: 5–17 October 2022 (week 50), and 26 April–8 May 2023 (Week 57). Samples are drawn from the US Census Bureau’s Master Address File in combination with its Contact Frame and contacted via email and text.
2.2. Data Source
The HPS is a nationally representative survey conducted by the US Census Bureau in partnership with 16 other federal agencies to collect timely data on the social and economic impacts of the COVID-19 pandemic. It is designed to produce national, state, and metro-level estimates of household experiences [20]. The survey collects information on a range of topics, including socio-demographic characteristics, employment status, food security, healthcare accessibility, physical and mental health, and COVID-19-related information, including vaccines, testing, and symptoms [20]. In October 2022 (Week 50), the HPS included information on how stressful the increase in prices in the last 2 months in areas where the respondents live or shop, which were categorized as very/moderately/a little/not at all stressful.
2.3. Study Sample
The study sample consisted of working-age adults (18–64 years of age) who responded that prices had increased in the areas they live in the past two months. Respondents with missing data on depression, anxiety, or stress due to inflation were excluded. The study included 24,150 and 33,262 working-age adults in week 50 and week 57, respectively, representing 75,166,217 and 73,280,979 working-age adults in the US.
2.4. Dependent Variables
The study examined two distinct dependent variables: anxiety and depression. The level of anxiety was assessed using the Generalized Anxiety Disorder (GAD-2) scale, with a threshold set at a score of three or higher to indicate the presence of anxiety within the individual’s experience [21]. Additionally, the HPS collected data on the Patient Health Questionnaire (PHQ-2) from the participants. In order to identify instances of depression, the PHQ-2 scores were categorized using a cutoff point of three, designating scores at or above this threshold as indicative of the presence of depression [22].
2.5. Key Explanatory Variables (Stress Due to Inflation and Time)
The key explanatory variable is stress due to inflation, which was measured using the following question: How stressful, if at all, has the increase in prices in the last 2 months been for you? Stress due to inflation (or “stress” thereafter) was dichotomized into (1) Very stressful’ and ‘Moderately stressful’ and (2) ‘A little stressful’ and ‘Not at all stressful’. For this paper, “stress due to inflation” will be referred as “stress”.
As we are interested in potential changes over time in the association between stress due to inflation and mental health outcomes, two other key explanatory indicators are the binary indicators for the time periods: 5–17 October 2022 (week 50) versus 26 April–8 May 2023 (Week 57). We combined the binary time indicator and stress due to inflation indicator to group the participants into four categories: (1) ‘Week 50 + Stress’; (2) ‘Week 57 + Stress’; (3) ‘Week 57 + No Stress’; and (4) ‘Week 50 + No Stress’. In statistical analyses, ‘Week 50 + No Stress’ was used as the reference group.
2.6. Other Explanatory Variables
We incorporated demographic variables (age and gender), race/ethnicity, social determinants of health (education, employment, lost income (a loss of employment income by individual or family member in the last 4 weeks), author(s) calculated poverty status based on the Federal Poverty Line (FPL), difficulty in meeting household expenses, food insecurity, marital status, and region). To calculate poverty status, income categories were converted to continuous values using a uniform distribution. The FPL was obtained from the ASPE official source: https://aspe.hhs.gov/poverty/figures-fed-reg-htm. Household incomes were then expressed as a percentage of the FPL using the uniform method, leading to the following categorization: Poor (<100% FPL), Near Poor (100–<200% FPL), Middle Income (200–400% FPL), and High Income (>400% FPL). Difficulty in meeting household expenses (no difficulty/little/moderate/very difficult) in the last 7 days was also included, as it is related to mental health problems [23]. We also adjusted for the long COVID and COVID-19 vaccinations, as research demonstrated their effects on mental health [24,25]. Random imputation was used to impute missing data on gender.
2.7. Statistical Analysis
The association of time periods with stress due to inflation, and the associations of stress with anxiety and depression were tested using Rao–Scott chi-square tests. Unadjusted logistic regressions were used to identify the association of time period with stress due to inflation for each characteristic of the subgroups. For example, for each gender (males, females, transgender) the association of time with stress was tested. Multivariable logistic regressions were used to analyze the adjusted associations of time, stress due to inflation, and the interaction of stress and time with anxiety and depression. In these regressions, we controlled for age, gender, race and ethnicity, poverty status, food insecurity, education, employment, lost income, difficulty meeting expenses, long COVID, COVID-19 vaccination status, marital status, and region. For explanatory variables with missing data, the missing indicators were used in the logistic regressions. We also used time-stratified multivariable logistic regressions to analyze the association of stress due to inflation with anxiety and depression in October 2022 and May 2023. In the tables, we report the unadjusted odds ratios (UOR), adjusted odds ratios (AOR) and 95% confidence intervals (CI). All analyses were conducted using the SAS survey procedure [26], which incorporated the replicate survey weights provided by the HPS. We also employed a jackknife approximation to adjust for variability in the estimation of these weights [27].
3. Results
Overall, 47% of working-age adults were females, and 2.8% reported being transgender. Working-age adults were 19% Latino and 10.6% Black/African American. Over half (54.4%) were currently married; 33.4% had college degrees; and 23.4% were 55–64 years of age (data not presented in tabular form).
The distribution of characteristics did not differ across Weeks 50 and 57 in age group, gender, race and ethnicity, marital status, food insecurity, health insurance coverage, and region (Table S1). However, the representation of Latinos (18.2% in week 50 vs. 19.7% in week 57) and Asians (5.6% vs. 6.1%) increased over time. The proportion of individuals never diagnosed with COVID-19 decreased from 47.7% in Week 50 to 40.5% in Week 57 (Table S1).
3.1. Stress Due to Inflation
78.7% of working-age adults reported experiencing stress due to inflation in May 2023, compared to 77.7% in October 2022 (UOR= 1.06 95% CI = 1.00, 1.13; p = 0.033 (Table 1). Among individuals with food insecurity, the prevalence of stress due to inflation was very high and remained at 98% (Table 1) in both time periods. Similarly, the prevalence of stress among working-age adults with incomes below 100% FPL (89.6% vs. 88.7%) and those who reported lost income from employment in their household during the past four weeks remained very high (92%).
Table 1.
Prevalence of stress due to inflation among working-age adults over time, according to the Household Pulse Survey (–14 October 22022 and 26 April–8 May 2023).
The prevalence of stress due to inflation significantly increased over time for specific subgroups (Table 1). For example, those finding it very difficult to meet expenses (97.9% vs. 99.1%) experienced a significant increase in stress due to inflation (Table 1). Non-Hispanic White (74.7% vs 76.2% (UOR, 95% CI = 1.09 [1.02, 1.16]), employed (76.1% vs. 77.6% (UOR [95% CI] = 1.09 [1.02,1.16]), middle income (UOR [95% CI] = 1.28 [1.14, 1.43]), and food secure individuals (UOR [95% CI] = 1.07 [1.01, 1.14]) were also more likely to report stress in May 2023 in comparison to October 2022 (Table 1).
3.2. Anxiety and Depression
Among all working-age adults, the prevalence of anxiety decreased by three percentage points from October 2022 to May 2023—35.4% vs. 32.1% (Table 2). In the fully adjusted logistic regression, working-age adults were less likely to report anxiety in May 2023 compared to October 2022 (AOR 95% CI = 0.86 [0.80, 0.94] (Table 3). Similarly, the prevalence of depression decreased by three percentage points from October 2022 to May 2023—25.5% vs. 22.6% (Table 2). In the fully adjusted logistic regression, working-age adults were less likely to report depression in May 2023 compared to October 2022 (AOR =0.85; 95% CI = 0.78, 0.93 (Table 3).
Table 2.
Description of working-age adults (age 18–64 years) with anxiety and depression (row percentages) Census Household Pulse Survey, 2–14 October 2022 (Week 50) and 26 April–8 May 2023 (Week 57).
Table 3.
Unadjusted odds ratios (UOR) and adjusted odds ratios (AOR) and 95% confidence intervals (CI) from separate logistic regressions on anxiety and depression in working-age adults (age 18–64 years) according to data from the Census Household Pulse Survey, 2–14 October 2022, and 26 April–8 May 2023.
As we are interested in the relationship of stress with anxiety and depression, we also compared the prevalence of anxiety and depression by week among the stress groups. There was a significant decline in the prevalence of anxiety in working-age adults with (41.8% vs. 37.6%) and without stress (12.9% vs. 11.9%) (Table 2). A fully adjusted logistic regression with interaction of stress with time period confirmed these findings. For example, those with stress in May 2023 were less likely to report anxiety compared to those with stress in October 2022 (AOR = 0.86 95% CI = 0.79, 0.93—results not reported in tabular form). Similarly, the prevalence of depression among individuals with stress due to inflation also declined from 34.1% in October 2022 to 29.8% in May 2023 (Table 2), and stressed individuals were less likely to report depression in May 2023 in comparison to October 2022, with AOR = 0.83 and 95% CI = 0.76, 0.91.
3.3. Pooled Cross-Sections-Multivariable Logistic Regression
In multivariable logistic regressions with pooled cross-sections, the odds of having anxiety or depression were more than twice as high among working-age adults with stress due to inflation compared to adults without stress (Table 3). More precisely, working-age adults with stress due to inflation were more likely to have anxiety (AOR = 2.50, 95% CI = 2.18, 2.86) and to have depression (AOR = 2.22, 95% CI = 1.92, 2.57) compared to those without stress (Table 3).
When the stress variable was interacted with time, we found that individuals with stress were more likely to have anxiety in week 50 (AOR = 2.69, 95% CI = 2.22, 3.26), as well as week 57 (AOR = 2.29, 95% CI = 1.88, 2.77), in reference to individuals with no stress due to inflation in week 50 (Table 3). A similar pattern was observed for depression (AOR = 2.48, 95% CI = 2.03, 3.03 for individuals with stress in week 50; AOR = 2.05, 95% CI = 1.68, 2.50 for individuals with stress in week 57 in reference to individuals with no stress in week 50) (Table 3). However, for both anxiety and depression, the confidence intervals of the interaction terms for stress and week overlap for week 50 and week 57. The descriptive result from Table 2 that anxiety and depression may be less prevalent in week 57 than in week 50 is, therefore, not confirmed by the fully adjusted regressions with interaction terms.
3.4. Stratified Multivariable Logistic Regression
We analyzed the associations of stress with anxiety and depression over time with time-stratified multivariable logistic regressions. Stress was positively associated with anxiety and depression in both time periods (Table 3). For anxiety, the AOR was 2.64 (95% CI = 2.15, 3.23) in October 2022, and 2.26 (95% CI = 1.93, 2.66) in May 2023. A similar pattern was observed for depression, with AOR = 2.53, 95% CI = [2.04, 3.14] in October 2022, and AOR = 1.90, 95% CI = [1.57, 2.31] in May 2023.
4. Discussion
The present study examined the prevalence of stress due to inflation and its association with anxiety and depression between October 2022 and May 2023 among working-age adults in the US using Census HPS data. Stress due to inflation is common, affecting more than three quarters of working-age Americans. We observed that, despite declining inflation rates, the prevalence of stress due to inflation among working-age adults increased by one percentage point over time, and the increase was statistically significant, thus affecting two million additional working-age adults.
The prevalence of stress was higher among individuals in disadvantaged SES situations in both time periods, such as individuals who reported difficulty in paying expenses or poor and low-income individuals. Some subgroups, however, showed some changes over time. For example, the middle-income group experienced an increase in stress due to inflation level over time. This persistent and increased stress over time among working-age adults grappling with economic hardship can be attributed, in part, to the unprecedented inflationary conditions at the time, possibly the highest inflation of their lifetimes [17]. It is important to note that, while the overall inflation rate may have diminished, price levels remained high, and the reduction in inflation concerning essential commodities, particularly food, has been significantly slower (Figure 1). This sluggish decline in food-related inflation has resulted in persistently high food prices, further exacerbating the economic strain faced by working-age individuals, including professional advancement and family responsibilities [5,28].
Stress due to inflation was associated with depression and anxiety in both time points. Previous research has consistently demonstrated the detrimental impact of macroeconomic factors, such as recessions, on mental health, with increased rates of anxiety, depression, and even suicidal thoughts [29,30,31]. Moreover, at an individual level, a comprehensive review revealed a strong association between financial hardship and depression [11]. These findings emphasize the significant influence of economic conditions on mental well-being, and underscore the need for targeted interventions and support during times of financial strain.
Overall, although stress due to inflation persisted over time, the prevalence of anxiety and depression was lower by 3 percentage points in May 2023 compared to October 2022, and the decline was statistically significant (p = 0.033). This decline could be partially explained by the differences in some characteristics between October 2022 and May 2023. For example, there was an increase in rates of employment and a decrease in the poverty rate in May 2023 compared to October 2022. Furthermore, the proportion of individuals expressing difficulty in paying expenses has declined (Table S1). Given that these factors have demonstrated significant associations with anxiety and depression [32], this may suggest that individuals are coping and/or adjusting to their stressful situations [33], or that individuals had more access to food banks or the Supplemental Nutritional Assistance Program (SNAP), with an increased use of food stamps over the past several years [34]. Our descriptive results suggest that, when examined by stress levels, the prevalence of anxiety and depression might have weakened over time for stressed individuals. With increased experience and exposure to handle such stress, individuals may become more adept at navigating challenges and maintaining emotional well-being [35]. To investigate the challenges posed by rising inflation, the HPS included several questions on coping strategies during both Week 50 and Week 57. Individuals experiencing stress employed a diverse array of coping strategies (ranging from 82.0% to 96.6% in October 2022, and 83.3% to 97.4% in May 2023) when confronting inflationary pressures, as opposed to those not experiencing stress (with a range of 3.4% to 18.0% in October 2022, and 2.6% to 16.7% in May 2023). The participants in April–May 2023 drove less or changed their mode of transportation as compared with the participants in October 2022; they were also more likely to shop at stores offering lower prices, look for sales, and use coupons. There was an increase in the proportion of respondents who canceled or reduced their magazine/cable subscriptions and worked additional jobs in April–May 2023 as compared with October 2022. These strategies indicated that efforts were being made to adjust to the inflationary environment. Apart from the coping strategies, there were more participants in April–May 2023 than in October 2020 who ate out less frequently (Table S2). These findings underscore the relationship of stress due to inflation with individuals’ financial and mental well-being.
The strength of this study lies in its comprehensive examination of the association of stress due to inflation with anxiety and depression among working-age adults. By comparing data from the HPS for two periods, the study provides valuable insights into the persistence of stress due to inflation and of its association with anxiety and depression during a time of post-pandemic recovery with declining inflation. Additionally, the study incorporates various demographic and socioeconomic factors, such as age, gender, income, and employment status, allowing for a more nuanced understanding of the complex relationship between stress due to inflation and mental health outcomes. The large sample size and statistical analysis further enhance the study’s validity and the generalizability of the findings to the broader population. While an earlier study [7] had shown an association between inflation hardships (e.g., purchasing less food, working additional jobs) and mental health problems, this study shows that stress due to inflation is associated with anxiety and depression, and may be a mechanism whereby inflation impacts health, whether or not individuals experience hardships.
Despite its strengths, this study has certain limitations that should be considered. Firstly, the data used in the analysis relies on self-reported responses from survey participants, which may be subject to recall bias or social desirability bias. Additionally, the study compared the most recent HPS survey (week 57) at the time the analysis was conducted with October 2022 (Week 50), when inflation was approximately 7%, not to the peak in July 2022, when inflation was 9%. HPS may not capture the long-term effects of stress due to inflation on mental health. The cross-sectional design of the study limits the ability to establish causal relationships between stress due to inflation and anxiety/depression. We use cross-sectional data with no information on the onset of anxiety and depression and whether it may have predated stress due to inflation. Further research on stress due to inflation and mental health would benefit from the use of longitudinal data. While stress due to inflation may adversely impact mental health, anxiety and depression may make individuals more likely to perceive and report stress due to inflation. Finally, there may be confounding factors that may affect both self-perceived stress and mental health, such as the presence or absence of social support networks, which may influence the observed association. Finally, the study primarily focuses on working-age adults and does not capture the experiences and mental health outcomes of older adults.
The study’s findings suggest the need for interventions to promote financial resilience to help individuals manage their finances during economic fluctuations and reduce stress due to inflation. In addition, greater access to affordable mental health services may help address stress due to inflation. Policies are needed to expand such support with a focus on underserved communities with culturally relevant care. Addressing systemic disparities, such as income inequality and access to mental health care, is crucial. Long-term monitoring and research on stress due to inflation are needed to understand its effects and develop interventions to reduce it. Collaboration among policymakers, healthcare providers, and community organizations is essential for implementing these recommendations and supporting affected individuals and communities.
5. Conclusions
In conclusion, stress due to inflation affects more than three-quarters of working-age adults in the US. Despite declining inflation, stress due to inflation persists, and continues to be associated with anxiety and depression. Stress due to inflation is a significant and persistent public health issue.
Supplementary Materials
The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/ijerph22010026/s1, Table S1: title; Description of Working-Age Adults (Age 18–64 years) by Week of Participation in the Census Household Pulse Survey, 2–14 October 2022 (Week 50) and April 26–May 8, 2023 (Week 57); Table S2: Title: Coping Mechanisms for Stress due to Inflation by Stress Level in Census Household Pulse Survey Respondents 2–14 October 2022 (Week 50) and 26 April –8 May 2023 (Week 57).
Author Contributions
Conceptualization, U.S., M.P. and S.M.; methodology, U.S., S.M. and M.P.; software, U.S., M.P. and J.P.; validation, U.S., M.P., J.P., R.C.W. and S.M.; formal analysis, U.S., M.P. and J.P.; investigation, all authors; resources, U.S.; data curation, U.S., M.P. and J.P.; writing—original draft preparation, M.P., S.M., U.S., H.W. and R.C.W.; writing—review and editing, P.A.F., B.Z., C.S., U.S.; visualization, J.P. and M.P.; supervision, U.S.; project administration, U.S., M.P. and J.P. All authors have read and agreed to the published version of the manuscript.
Funding
The project described was supported the by National Institute of Health (NIH)/Artificial Intelligence/Machine Learning Consortium to Advance Health Equity and Researcher Diversity Grant # 1OT2OD032581-02 (Usha Sambamoorthi) and the National Institute of General Medical Sciences, 5U54GM104942-07 (R Constance Winer). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.
Institutional Review Board Statement
Ethics review and approval were waived for this study because we used a secondary dataset.
Informed Consent Statement
Not applicable, as we did not collect the data.
Data Availability Statement
No restrictions apply to the availability of these data. Data were obtained from the US Census Bureau, and are available at https://www.census.gov/programs-surveys/household-pulse-survey/datasets.html (accessed on 11 September 2024).
Conflicts of Interest
The authors declare no conflicts of interest.
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