The publishing and editorial teams would like to thank the following, for their invaluable service as 2021 reviewers for this journal. We are very grateful for the contributions made. With their help, the journal has been able to publish such high-quality articles:
| Abdulkader, Bisan |
| Abdulmuhsin, Amir |
| Abhayawansa, Subhash |
| Ahmed, Syed Saad |
| Alam, Syed Hasnain |
| Alama Salazar, Elsa |
| Almici, Alex |
| AlQershi, Nagwan |
| Alshebami, Ali |
| An, Yi |
| Andrades, Javier |
| Andrei, Andreia |
| Andreini, Daniela |
| Anwar, Muhammad |
| Aprile, Roberto |
| Aramburu, Nekane |
| Ardito, Lorenzo |
| Arun, Korhan |
| Ashfaq, Khurram |
| Asiaei, Kaveh |
| Ayaburi, Emmanuel |
| Bader, Benjamin |
| Baima, Gabriele |
| Ballestra, Luca Vincenzo |
| Barajas, Angel |
| Barreiro Pereira, Fernando |
| Barrutia, Jose M. |
| Battisti, Enrico |
| Beltramino, Nicolas |
| Bergamaschi, Mara |
| Bertello, Alberto |
| Bhatti, Sabeen |
| Booker, Lorne |
| Cabrilo, Sladjana |
| Canestrino, Rossella |
| Caporuscio, Andrea |
| Caputo, Andrea |
| Caputo, Francesco |
| Casprini, Elena |
| Castilla-Polo, Francisca |
| Cavicchi, Caterina |
| Cepeda-Carrión, Gabriel |
| Chavan, Meena |
| Che, Tong |
| Chen, Jianbin |
| Chen, Minling |
| Chierici, Roberto |
| Chijoke-mgbame, Marian |
| Chin, Tachia |
| Chiucchi, Maria Serena |
| Ciambotti, Massimo |
| Cillo, Valentina |
| Cohen, Sandra |
| Coluccia, Daniela |
| Cordazzo, Michela |
| Corinna, Tachia |
| Corsi, Simone |
| Corvino, Antonio |
| Crammond, Robert |
| Cristofaro, Matteo |
| Crupi, Antonio |
| D'Amore, Gabriella |
| Del Chiappa, Giacomo |
| Deng, Fang |
| Dhir, Amandeep |
| Di Vaio, Assunta |
| Dimitropoulos, Panagiotis |
| Du Plessis, Tanya |
| Edvinsson, Leif |
| Elia, Gianluca |
| Emelifeonwu, Jude |
| Evangelos, Tsoukatos |
| Fait, Monica |
| Fakhar Manesh, Mohammad |
| Faraoni, Monica |
| Farina Briamonte, Massimiliano |
| Fernández Pérez de la Lastra, Susana |
| Ferraris, Alberto |
| Festa, Giuseppe |
| Fiano, Fabio |
| Forliano, Canio |
| Galati, Antonio |
| Gallardo-Vázquez, Dolores |
| Gangi, Francesco |
| Gangopadhyay, Partha |
| Garanina, Tatiana |
| García-Carbonell, Natalia |
| Garcia-Perez, Alexeis |
| Gentile, Teresa Anna Rita |
| Giacosa, Elisa |
| Giuliani, Marco |
| Graziano, Elvira Anna |
| Greco, Giulio |
| Gueldenberg, Stefan |
| Gupta, Manjul |
| Ha, Tri |
| Harmono, Harmono |
| Hina, Khushbakht |
| Huang, Yufei |
| Hussinki, Henri |
| Jafari-Sadeghi, Vahid |
| Jardon, Carlos |
| Kansal, Monika |
| Khatami, Fahimeh |
| Kiran, Ravi |
| Koronios, Konstantinos |
| Labra, Romilio |
| Lai, Yanzhao |
| Lardo, Alessandra |
| Le, Hanh |
| Leitão, João |
| Leitner, Karl-Heinz |
| Liang, Nan (Peter) |
| Lin, Carol |
| Liu, Zihan |
| Luo, Chuan |
| Luqman, Adeel |
| Magna, Oscar |
| Magni, Domitilla |
| Magnier-Watanabe, Remy |
| Mahto, Raj |
| Malkawi, Bashar H. |
| Martín-de Castro, Gregorio |
| Martínez-Martínez, Aurora |
| Martins, Isabel |
| Massaro, Maurizio |
| Matozza, Felice |
| Mazzucchelli, Alice |
| Molina azorin, Jose |
| Molodchik, Mariia |
| Moona Haji Mohamed, Ramesh Kumar |
| Murray, Alan |
| Nadeem, Muhammad |
| Ndou, Valentina |
| Nemlioglu, Ilayda |
| Nicolò, Giuseppe |
| Nicotra, Melita |
| Nielsen, Christian |
| Nirino, Niccolò |
| Novas, Jorge |
| Occhipinti, Zeila |
| Okoli, Justin |
| Orlando, Beatrice |
| Palladino, Rosa |
| Panda, Madhusmita |
| Papa, Armando |
| Patel, Parth |
| Pellegrini, Massimilliano |
| Perano, Mirko |
| Petruzelli, Antonio |
| Pflugfelder, Nina |
| Pucci, Tommaso |
| Rammal, Hussain |
| Raudeliuniene, Jurgita |
| Reppas, Dimitrios |
| Ricciardi, Francesca |
| Rondi, Emanuela |
| Rossi, Matteo |
| Sahibzada, Umar |
| Salas-Vallina, Andrés |
| Sansone, Giuliano |
| Santoro, Gabriele |
| Schneider, Martin |
| Shafique, Imran |
| Shankar, Amit |
| Singh, Deeksha |
| Singh, Poonam |
| Singh, Sanjay |
| Singla, Harish |
| Ståhle, Sten |
| Svarc, Jadranka |
| Temouri, Yama |
| Thomas, Asha |
| Trillo Holgado, Maria Amalia |
| Troise, Ciro |
| Tzanidis, Theo |
| Vafaei, Alireza |
| Valli, Robert |
| Van Der Waal, Mark |
| VARRA, Lucia |
| Veltri, Stefania |
| Villasalero, Manuel |
| Vlacic, Bozidar |
| Vo, Duc |
| Wang, Cizhi |
| Wang, Meng |
| Wang, Zhining |
| Wei, Yu-Chen |
| Wensley, Anthony |
| Wijeweera, Albert |
| Will, Markus |
| Wudhikarn, Ratapol |
| Wulf, Inge |
| Yosano, Tadanori |
| Younis, Raghda |
| Zavertiaeva, Marina |
| Zhang, Yingying |
| Zheng, Haichao |
| Zlatković Radaković, Matea |