Rigorous peer-review is the corner-stone of high-quality academic publishing. The editorial team greatly appreciates the reviewers who contributed their knowledge and expertise to the journal’s editorial process over the past 12 months. In 2018, a total of 16 papers were published in the journal, with a median time to first decision of 15 days and a median time to publication of 53.5 days. The editors would like to express their sincere gratitude to the following reviewers for their cooperation and dedication in 2018:
| Ahmaed, Alzaghal | Mario Anderson, De Oliveira |
| Anatoly, Saveliev | Mario, De Castro |
| Antonio A., Golpe | Mavis, Pararai |
| Antonio, Lopez-Quilez | Michael, Lang |
| Apostolos, Batsidis | Min, Wang |
| Athanasios, Sachlas | Mirko, Polato |
| Bernardo Lagos, Alvarez | Mirosław, Krzyśko |
| Biman, Chakraborty | Mohamed, Talea |
| Broderick O., Oluyede | Mohamed, Abdel-Basset |
| Camila Borelli, Zeller | Moreno, Ursino |
| Cong, Gao | Muhammad, Aslam |
| Di, Qi | N. R., Abeynayake |
| Elena, Druica | Parmanand, Sinha |
| Elio, Chiodo | Patrick, Trainor |
| Engin, Sungur | Paula Odete, Fernandes |
| Erlandson Ferreira, Saraiva | Paweł, Oświęcimka |
| F.J., Vazquez Polo | Pedro, Macedo |
| Fernando, Marmolejo-Ramos | Pedro, Morettin |
| Frank, Gomes-Silva | Pierre, Druilhet |
| Fuqing, Yuan | Pilar, Fuster-Parra |
| Gholamhossein, Hamedani | Pushpa, Rathie |
| Haitham M., Yousof | Qiang, Cheng |
| Indranil, Ghosh | Reza, Drikvandi |
| Ioannis E., Tsolas | Riccardo, Gatto |
| Ivan, Matic | Rubén, Jerves-Cobo |
| Ivy, Liu | Sajid, Ali |
| Janos, Kertesz | Shuangzhe, Liu |
| Jeremias, Leao | Shun-Peng, Zhu |
| Joanna, Tyrcha | Sucharita, Ghosh |
| Jorge Luis Bazán, Guzmán | Sujay, Datta |
| José, Sarabia | Tibor K., Pogány |
| Juliana, Cobre | Vivekananda, Roy |
| Justin, DeSimone | Vojkan, Mihajlović |
| Krzysztof A., Domino | Wan, Tang |
| Lean, Yu | Wenhao, Gui |
| Liliya, Demidova | Woojoo, Lee |
| M. H. Tahir | Xianzheng, Huang |
| Marcel, Ausloos | Xiaoling, Xu |
| Marcelino A. R., De Pascoa | Yichuan, Zhao |
| Marcelo, Bourguignon | Yongze, Song |
© 2019 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).