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:

Abdel-Haleim, Sahar
AboElsoud, Mostafa
Adams, John
Adams, John
Aftab, Rehan
Al-Ayouty, Iman
Al-Najjar, Dania 
Alam, Samsul
Aminian, Nathalie
Andoh, Francis
Arthur, Lilian
Badreldin, Ahmed
Bai, Ye
Bale┼żentis, Tomas 
Bariviera, Aurelio
Chen, Fuzhong
El-Khishin, Sarah
Elish, Eman
Elshamy, Hany
Fakhreldin, Hadia
Fareed, Zeeshan
Ferreira, Paulo
Fida, Bashir
Ghoneim, Hebatallah
Grancay, Martin
Hammam, Rasha
Hassaballa, Hoda
He, Juan
Imran, Muhammad 
Incaltarau, Cristian 
Jaworski, Piotr
Jin, Fei
Jiquan, Peng
Kirby, David
Kostakis, Ioannis
Larue, Patrick
Lau, Evan
Lu, Jian
Mao, Haitao
Melgar, Natalia
Nie, Fei
Paparas, Dimitrios
Prange, Christiane
Ramos, Raul 
Shaaban, Safaa
Shehzad, Khurram
Sileem, hanan
Struthers, John
Tahir, Muhammad
Tiwari, Aviral Kumar
Tremma, Ourania
Wang, Yongqing
Yue, Yang
Zhou, Tianyun