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:
| A. Christou, Prokopis |
| Abreu, Luciano Muniz |
| Adeleke, Bola |
| Adie, Bailey |
| Aktas, Gurhan |
| Al-Ansi, Amr |
| AlBattat, Ahmad |
| Albayrak, Tahir |
| Ali, Nazia |
| Allan, Mamoon |
| Alvarez-Diaz, Marcos |
| Amore, Alberto |
| Anguera-Torrell, Oriol |
| Anjos, Francisco Antonio Dos |
| Anjos, Sara Joana |
| Apollo, Michal |
| Ari, Engin |
| Arlt, Wolfgang Georg |
| Armadita, Filza |
| Arnhold-Junior, Marcos |
| Astor, Yackob |
| Azevedo, Antonio |
| Aznar Alarcón, Juan Pedro |
| Baiquni, Muhammad |
| Baker, David |
| Balińska, Agata |
| Balsas, Carlos |
| Basurto-Cedeño, Estefania Mercedes |
| Battour, Mohamed |
| Belarmino, Amanda |
| Benítez-Aurioles, Beatriz |
| Bhati, Abhishek |
| Birdir, Kemal |
| Boger, Carl |
| Borges, Vicente |
| Brida, Juan Gabriel |
| Briggs, Alan |
| Bristow, Robert |
| Bui, Phuong |
| Caber, Meltem |
| Çakar, Kadir |
| Camargo, Blanca |
| Carvalho, Mariana |
| Casais, Beatriz |
| Cassia, Fabio |
| Cecil, Amanda |
| Cerdan Schwitzguébel, Aurélie |
| Cetin, Gurel |
| Chan, Chung Shing |
| Chan, Jennifer |
| Chang, Janet |
| Chang, TC |
| Chasovschi, Carmen |
| Che, Deborah |
| Cheah, Jun-Hwa |
| Cheer, Joseph |
| Chen, Ganghua |
| Chen, Li-Hsin |
| Chen, Margaret |
| Chen, Tzu-Ling |
| Chenqiao, K |
| Chiu, Weisheng |
| Choe, Yeongbae |
| Choudhary , Pooja |
| Clancy, Michael J. |
| Coca-Stefaniak, J. Andres |
| Dangi, Tek |
| Davari, Dori |
| Davras, Özgür |
| Day, Jonathon |
| De Matos, Nelson |
| DE NONI, IVAN |
| Do Carmo, Manuel |
| Edwards, Deborah |
| Eyisi, Afamefuna |
| Fabry, Nathalie |
| Fakfare, Pipatpong |
| Falk, Martin |
| Fedeli, Giancarlo |
| Fehrest, Farima |
| Florek, Magdalena |
| Frenzel, Fabian |
| Frost, Jennifer |
| Fu, Jing |
| Garay Tamaion, Luis |
| Gharehbaghi, Koorosh |
| Ghidouche, Faouzi |
| Gorchakova, Valentina |
| Gowreesunkar, Vanessa |
| Griffin, Tom |
| Grimmer, Louise |
| Gross, Sven |
| Gupta, Vikas |
| Hji-Avgoustis, Sotiris |
| Hussain, Sarah |
| Io, Man U |
| Isaac, Rami |
| Ismail, Hairul |
| Jain, Jinesh |
| Jamshidi, Dariyoush |
| Kausar, Devi Roza K. |
| Kennell, James |
| Keshavarz, Yousef |
| Khan, Syed Abdul Rehman |
| Khodadadi, Masood |
| Kim, Bona |
| Kim, Hong-bumm |
| Kirillova, Ksenia |
| Kitheka, Bernard |
| Koh, Edward |
| Kokkranikal, Jithendran |
| Kong, Frances |
| Kong, Weng Hang |
| Korstanje, Maximiliano |
| Kowalczyk-Anioł, Joanna |
| Kozak, Metin |
| Krolikowska, Ewa |
| Kumar, Dharmendra |
| Kumar, Divesh |
| Kusumawardhana, Indra |
| Lachhab, sofia |
| Lam, Cindia |
| Lam, Iok Keng |
| Latuszek, Natalia |
| Lau, Meng Chan |
| Lee, Derrick CH |
| Lei, Clara |
| Lei, Simon |
| Lemy, Diena Mutiara |
| Leng, Ho Keat |
| Lexhagen, Maria |
| Li, Jiawei |
| Li, Jing |
| Li, Xiangping |
| Lichrou, Maria |
| Lim, Sonia |
| Lim, Weng Marc |
| Lin, Yuan |
| Liu-Lastres, Bingjie |
| Loi, Kim Ieng |
| Lopez-Guzman, Tomas |
| Loverio, Jennifer |
| Mao, Mary |
| Marcos, Jose Maria |
| Maxim, Cristina |
| Mearns, Kevin |
| Meng, Mark |
| Mohamad, Diana |
| Mohamed, Mohamed |
| Mohammad Afandi, Syamsul Herman |
| Mohammadi, Zohre |
| Morrison, Alastair |
| Muangasame, Kaewta |
| Muhammad, Mohd Zulkifli |
| Munoz, Kyrie Eleison |
| Nag, Aditi |
| Nandasena, Roshini |
| Naumov, Nick |
| Nawrocka, Elżbieta |
| Ng, Yen Nee |
| Ngan, Henrique |
| Nguyen, Huy Khanh |
| Nguyen, Thi Hong Hai |
| Nuryanti, Wiendu |
| Oktadiana, Hera |
| Olt, Gergely |
| Önder, Irem |
| Ong, Lei Tin |
| Pabel, Anja |
| Panda, Tapan Kumar |
| papadopoulou, Lemonia |
| Papatheodorou, Andreas |
| Paraskevas, Alexandros |
| Park, Jinah |
| Park, Minkyung |
| Pavlić, Ivana |
| Pengiran Bagul, Awangku Hassanal Bahar |
| Perez, Cynthia |
| Perles-Ribes, Jose Francisco |
| Petruzzi, Marina |
| Pharino, Chonlada |
| pirnar, ige |
| Poulaki, Ioulia |
| Powell, Raymond |
| Pratt, Stephen |
| Prince, Solene |
| Pusiran, Arif Kamisan |
| Qi, Shanshan |
| Qiu, Hongliang |
| Rahmafitria, Fitri |
| Rahmanita, Myrza |
| Raikkonen, Juulia |
| Ram, Yael |
| Ramkissoon, Haywantee |
| Rather, Raouf |
| Rendeiro Martín-Cejas, Roberto |
| Ribeiro de Almeida, Claudia |
| Rittichainuwat, Bongkosh |
| Robledo, Marco Antonio |
| San Martin, Hector |
| Sattarzadeh, Neda |
| Scarinci, Janice |
| Seabra, Claudia |
| Seetanah, Boopen |
| Šegota, Tina |
| Sequeira Couto, Ubaldino |
| Seraphin, Hugues |
| Setiyorini, Heri Puspito Diyah |
| Seyfi, Siamak |
| Seyfi, Siamak |
| Shao, Jun |
| Shekhar, Suraj |
| Shen, Ye |
| Shirvani Dastgerdi, Ahmadreza |
| Siakwah, Pius |
| Sima, Claudia |
| Singh, Simarjeet |
| Slabbert, Elmarie |
| Slivar, Iva |
| So, Amy |
| Souza, Luis |
| Spirou, Costas |
| Sprechmann, Martin |
| Stepchenkova, Svetlana |
| Sung, Pei-Ling |
| Sutono, Anang |
| Swart, Nellie |
| Tahir, Shaharuddin |
| Tan, Keith |
| Tang, Liang |
| Thi Thanh Kieu, Nguyen |
| Timothy, Dallen |
| Tran, Trung Nhat |
| Tse, Serene |
| Tsiami, Amali |
| Usher, Lindsay |
| Uysal, Muzzo |
| Van Zyl, Cina |
| Vareiro, Laurentina |
| Vinnicombe, Thea |
| Walia, Nidhi |
| Walia, Sandeep |
| Wall, Geoffrey |
| Walters, Gabby |
| Wan, Yim King Penny |
| Wang, Fang |
| Wang, Jianying |
| Wang, Sha |
| Wang, Xuan (Lorna) |
| Wardana, Made |
| Webster, Craig |
| Wen, Jun-Jie |
| Wober, Karl |
| Wong, Cora Un In |
| Wong, Jose WengChou |
| Wu, Hung-Che |
| Wu, Maoying |
| Xu, Ding |
| Xu, Jing Bill |
| Xue, Lin Lin |
| Yagi, Chiemi |
| Yoopetch, Chanin |
| Zainal, Munawaroh |
| Zaman, Mustafeed |
| Zhan, Li |
| Zhang, Jiangchi |
| Zhang, Jingru |
| Zhong, Lina |
| Zulkarnain, Arif |