The editorial team greatly appreciates the reviewers who have dedicated their considerable time and expertise to the journal’s rigorous editorial process over the past 12 months, regardless of whether the papers are finally published or not. In 2019, a total of 75 papers were published in the journal, with a median time to first decision of 20 days and a median time from submission to publication of 59 days. The editors would like to express their sincere gratitude to the following reviewers for their generous contribution in 2019:
| Abdollahi, Ali | Lacko, Milan |
| Acker, Jörg | Lee, Junseop |
| Agar, Ertan | Lee, Seok Woo |
| Akbari Garakani, Mohammad | Lekavičius, Vidas |
| Alcoutlabi, Mataz | Li, Jianlin |
| Almeida, Jose | Li, Yiyan |
| Álvarez Antón, Juan Carlos | Lin, Jeng-Chyan Muti |
| Anseán, David | Liu, Lin |
| Appetecchi, Giovanni Battista | López, David Marrero |
| Arbizzani, Catia | López, José María |
| Arenas, Luis Fernando | Lu, Yi-Hsien |
| Bahramipanah, Maryam | Machno, Magdalena |
| Barez, Fred | Marinca, Vasile |
| Bastante-Ceca, Maria Jose | Mehmood, Khawaja Khalid |
| Battistel, Alberto | Miele, Ermanno |
| Behrou, Reza | Mindemark, Jonas |
| Beschkov, Venko | Mishra, Kuber |
| Bhattarai, Arjun | Mosa, Islam |
| Brezesinski, Torsten | Nascimento, Micael |
| Bronin, Dimitriy | Nenadic, Nenad |
| Buciakowski, Mariusz | Nguyen Hong, Nhung |
| Burzyński, Damian | Ni, Jiangfeng |
| Campillo, Jose Miguel | Olchowka, Jacob |
| Casals, Lluc Canals | Ostanek, Jason |
| Cen, Yinjie | Owen, John |
| Cerdas, Felipe | Painter, Roger |
| Chen, Chi | Papurello, Davide |
| Chen, Chunhui | Pauliukaite, Rasa |
| Chrenko, Daniela | Pehlken, Alexandra |
| Ciszewski, Mateusz | Pelegov, Dmitry |
| Conti, Massimo | Peters, Jens |
| Creager, Stephen E. | Peters, Kara |
| Cumming, Denis | Placke, Tobias |
| Das, Abhishek | Pontiroli, Daniele |
| Dawson, James A. | Raccichini, Rinaldo |
| Delgado, Joaquim | Raucci, Umberto |
| Desprez, Philippe | Rechberger, Helmut |
| Devie, Arnaud | Redondo-Iglesias, Eduardo |
| Dhindsa, Kulwinder Singh | Safa, Meer |
| Di Noto, Vito | Safaei, Mohammad Reza |
| Dimitrakopoulos, Georgios | Sankarasubramanian, Shrihari |
| Du, Xusheng | Sarrias-Mena, Raúl |
| Dubarry, Matthieu | Schaefer, Jennifer |
| Dunn, Jennifer B. | Schmidt, Jan Philipp |
| Ehrenberg, Helmut | Schweiss, Ruediger |
| El Ghossein, Nagham | Serrano, Juan Carlos |
| Evtugyn, Gennady | Shadike, Zulipiya |
| Flox, Cristina | Shaw Stewart, James |
| Fu, Guopeng | Silva, Maria Manuela |
| Ghannoum, AbdulRahman | Singh, Rajendra |
| Ghatak, Kamalika | Smiatek, Jens |
| Gheorghiu, Razvan Andrei | Solomon, Barry |
| Gonzalez Vila, Alvaro | Struzik, Michal |
| Granata, Giuseppe | Sutherland, John |
| Guarnieri, Massimo | Svoboda, Vojtech |
| Gueorguiev, G.K. | Tadanaga, Kiyoharu |
| Guo, Xiaoru | Takeguchi, Tatsuya |
| Han, Weiji | Tapia-Ruiz, Nuria |
| Hao, Yong | Todd, Rebecca |
| Harris, Stephen J. | Torres Zafra, Juan Carlos |
| Hinds, Gareth | Tübke, Jens |
| Hotta, Yasuhiko | Uno, Masatoshi |
| Hu, Jun | Van Den Bossche, Peter |
| Hung, Tai-Feng | Viviani, Massimo |
| Huot, Jacques | Vondrák, Jiří |
| Ilea, Petru | Wachowski, Sebastian |
| Inada, Ryoji | Wang, Huan |
| Jezowski, Pawel | Wang, Xiaoya |
| Ji, Dongsheng | Wang, Xueju |
| Jiang, Qiu | Watanabe, Ken |
| Jothi, Palani Raja | Weng, Guo-Ming |
| Julien, Christian M. | Wittler, Olaf |
| Jun, Young-Si | Worwood, Daniel |
| Jung, Sunghun | Wu, Billy |
| Kazda, Tomáš | Xue, Lianjie |
| Kim, Hyun Tak | Yang, Xiaoguang |
| Kim, Hyung Chul | Yang, Xiaoyun |
| Kim, Sangtae | Yu, Jaecheul |
| Kim, Youngki | Yue, Yuan |
| Klotz, Dino | Zaghib, Karim |
| Knap, Vaclav | Zhan, Xiaowen |
| Knehr, Kevin | Zhang, Xuyang |
| Koohbor, Behrad Behrad | Zhang, Qifeng |
| Kowal, Julia | Zhang, Sheng S. |
| Krumeich, Frank | Zhao, Evan Wenbo |
| Kumagai, Seiji | Zhou, Joe |
| Kundu, Manab | Zhou, Xin |
| Kurdve, Martin | Zhuang, Shiqiang |
| Kvasha, Andriy |
© 2020 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/).