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:
| Abd Rahman, Nur Hidayah |
| Abdullah, Mokhtar |
| Abhari, Sara |
| Abraham, Villy |
| Abrate, Graziano |
| Abror, Abror |
| Abyaran, Parisa |
| Adan Gok, Ozge |
| Agapito, Dora |
| Ai Na, Seow |
| Ai, Chi-Han |
| Airey, David |
| Al-Romeedy, Bassam |
| Alam, Syed Hasnain |
| Albuquerque, Andre |
| Ale Ebrahim, Nader |
| Alén González, Elisa |
| Ali, Faizan |
| Ali, Sadaqat |
| Almeida, Nuno |
| Alvarez-Diaz, Marcos |
| Alvarez, Maria |
| Amer, sally |
| Amin, Asad |
| Anagnostopoulou, Seraina |
| Anaya-Sánchez, Rafael |
| Andrianto, Tomy |
| Arcodia, Charles |
| Assiouras, Ioannis |
| Asthana, Shekhar |
| Au, Norman |
| Augustyn, Marcjanna |
| Bachinger, Monika |
| Backer, Elisa |
| Badoc-Gonzales, Blesilda |
| Baggio, Rodolfo |
| Bahja, Frida |
| Baker, David |
| Barbieri, Carla |
| Bausch, Thomas |
| Beise-Zee, Rian |
| BELLIA, Claudio |
| Beritelli, Pietro |
| Bethune, Elecia |
| Bhatia, Shivangi |
| Bhattacharya, Subhajit |
| Białk-Wolf, Anna |
| Bibi, Sughra |
| Bichler, Bernhard |
| Bilgili, Faik |
| Biswas, Joydeep |
| Blasco López, Maria Francisca |
| Blázquez-Salom, Macià |
| Borghi, Matteo |
| Boukamba, Hermann Kimo |
| Breakey, Noreen |
| Bregoli, Ilenia |
| Bremser, Kerstin |
| Bu, Naipeng |
| Buhalis, Dimitrios |
| Bujisic, Milos |
| Butler, Richard |
| Cabral Vieira, José António |
| Çakar, Kadir |
| Çakıcı, Abdulcelil |
| Can, Ali Selcuk |
| Cannas , Rita |
| Carballo, Rita |
| Carr, Neil |
| Carvache-Franco, Wilmer |
| Carvalho, Liliana |
| Cavusoglu, Muhittin |
| chandra, shweta |
| Cheer, Joseph |
| Chelliah, Shankar |
| Chen, Emily Jinyan |
| Chen, Ganghua |
| Chen, Juan |
| Chen, Qian |
| Chen, Sandy |
| Cheng, Ching-Chan |
| Cheng, Jin |
| Cheung, Catherine |
| Chi, Nguyen Thi Khanh |
| Chi, Xiaoting |
| Chin, Chee Hua |
| Chin, Phaik Nie |
| Chin, Wei Lee |
| Chiu, Weisheng |
| Chiu, Yung-ho |
| Choi, Miju |
| Chowdhary, Nimit |
| Christou, Prokopis |
| Chrysikou, Evangelia |
| Chu, Angela Mai Chi |
| Coccossis, Harry |
| Cocolas, Nicole |
| Coelho, António |
| Coetzee, Willem |
| Collins-Kreiner, Noga |
| Conefrey, Anita |
| Crotts, John |
| Crowley-Cyr, Lynda |
| Cui, Rui |
| Dai, You-Yu |
| Damian, Ionela Mihaela |
| De Rooij, Pieter |
| Dedeoğlu, Bekir Bora |
| Del Chiappa, Giacomo |
| Deng, Weiwei |
| Díaz-Carrión, Isis |
| Diekmann, Anya |
| Dimanche, Frederic |
| Dimitrovski, Darko |
| Dini, Mauro |
| Dodds, Rachel |
| Dolnicar, Sara |
| Dominique-Ferreira, Sergio |
| Dorcic, Jelena |
| Dubois, Louis-Etienne |
| Dutt, Christopher |
| Dwyer, Larry |
| Eddy U, Mary |
| Efthymiou, Leonidas |
| Egger, Roman |
| Ekiz, Erdogan |
| Elbaz, Ahmed Mohamed |
| Fadlon, Leslie |
| Fakfare, Pipatpong |
| Falk, Martin |
| Fan, Daisy |
| Fang, Yelin |
| Farcnik, Dasa |
| Farmaki, Anna |
| Femenia-Serra, Francisco |
| Fennell, David |
| Figueroa-Domecq, Cristina |
| Filep, Sebastian |
| Filieri, Raffaele |
| Florido-Benítez, Lázaro |
| Font, Xavier |
| Frent, Cristi |
| Fritz, Klaus |
| Frochot, Isabelle |
| Fu, Yan-Kai |
| Fuchs, Galia |
| Fuchs, Matthias |
| Fyall, Alan |
| Gajdošík, Tomáš |
| Gallarza, Martina |
| Gardiner, Sarah |
| Gertner, Rosane |
| Gewinner, Irina |
| Ghasemi, Matina |
| Ghosh, Munmun |
| Ghosh, Sudeshina |
| Gkritzali, Alkmini |
| Go, Hanyoung |
| Godovykh, Maksim |
| Goel, Pooja |
| Gogo, Adol |
| Goh, Edmund |
| Gomez Punzón, Jonathan |
| Gonzalez Gomez, Manuel |
| Graham, Anne |
| Gretzel, Ulrike |
| Gricar, Sergej |
| Griffin, Tom |
| Gross, Sven |
| Gül, Ilker |
| Gunter, Ulrich |
| Gupta, Vikas |
| Gursoy, Dogan |
| Haecker, Sanja |
| Haider, Asim |
| Hao, Yu |
| Happ, Eva |
| Harrington, Dennis |
| Hartwell, Heather |
| Haverila, Matti |
| Holmes, Kirsten |
| Hon Snir, Shlomit |
| Höpken, Wolfram |
| Hou, Fujun |
| Hsiao, Aaron |
| Hsu, Bryan Cheng-Yu |
| Huan, Tzung-Cheng |
| Huang, Rong |
| Huang, Ting Yen |
| Huang, Wei-Jue |
| Huang, Yu-Chih |
| Hung, Kam |
| Ibáñez-Sánchez, Sergio |
| Inversini Lausanne, Alessandro |
| Iovino, Felicetta |
| Iqbal, Zahid |
| Irani, Hamid Reza |
| Ivanov, Stanislav |
| Ivars-Baidal, Josep A. |
| Iyanna, Shilpa |
| JAIN, D. |
| Jain, Mahima |
| Jalilvand, Mohammad Reza |
| Jamal, Tazim |
| Japutra, Arnold |
| Jenkins, Carson |
| Jha, Ravi |
| Jha, Stuti |
| Ji, Chunli |
| Jia, Guangmei |
| Jin, Xin |
| Johnson, Abbie-Gayle |
| Johnston, Tony |
| Kallmuenzer, Andreas |
| Karatepe, Osman |
| Kazakov, Sergey |
| Keller, Barbara |
| Khan, Asif |
| Khan, Mohammad Jamal |
| Khodadadi, Masood |
| Kim, Sung-Bum |
| Kim, Wonjoon |
| Kim, Yoo Ri |
| King HK, Brian |
| Kladou, Stella |
| Klein, Ross |
| Knezevic Cvelbar, Ljubica |
| Koens, Ko |
| Konaklioglu, Ece |
| Kong, Haiyan |
| Korfiatis, Nikos |
| Korstanje, Maximiliano |
| Kozak, Metin |
| Kuang, Hongyun |
| Kumar, Surender |
| Kumar, Vimal |
| Kurniawati, Rina |
| Kuščer, Kir |
| Ladkin, Adele |
| Lam, Desmond |
| Law, Colin |
| Law, Rob |
| Lebe, Sonia Sibila |
| Lebe, Sonja Sibila |
| Lee, Seul Ki |
| Lei, Sut Ieng |
| Lemmetyinen, Arja |
| Leri, Ifigeneia |
| Leung, Daniel |
| Leung, Rosanna |
| Leung, Xi |
| Lexhagen, Maria |
| Li, Bin |
| Li, Bin |
| Li, Fangxuan(Sam) |
| Li, Keyin |
| LI, Li |
| Li, Minglong |
| LI, Mingwei |
| Li, Qinghui |
| Li, Ting (Tina) |
| Li, Xin |
| Li, Ying |
| Li, Zhiyong |
| Liang, Austin Rong-Da |
| Liang, Xinwen |
| Liasidou, Sotiroula |
| Light, Duncan |
| Lin, Jie-Heng |
| Lin, Meizhen |
| Lin, Michael |
| Lin, Mingliang |
| Lin, Shanshan |
| Liu, Anyu |
| liu, Huiyue |
| Liu, Jingyan |
| Liu, Ting |
| Liu, Xinyi |
| Liu, Yaping |
| Lockwood Sutton, Jo |
| Lohmann, Gui |
| López-Tenorio, Pablo |
| Lu, Changbao |
| Lubbe, Berendien |
| Lubowiecki-Vikuk, Adrian |
| Luo, Qiuju |
| Lusby, Carolin |
| Lyu, Jiaying |
| Maggi, Rico |
| Malhotra, Gunjan |
| Manaloor, Varghese |
| Mandal, Santanu |
| Manente, Mara |
| Mariani, Marcello |
| Marino, Alfonso |
| Markovic, Suzana |
| Martinez Gonzalez, Jose Alberto |
| Martseniuk, Larysa |
| Masiero, Lorenzo |
| Mastronardi, Luigi |
| Mathew, Jones |
| Matos Graça Ramos, Paulo |
| Mavragani, Eleni |
| McCartney, Glenn |
| Mcgrath, Patricia |
| McLeod , Michelle |
| McLoughlin, Emmet |
| Medhekar, Anita |
| Meeprom, Supawat |
| Mellinas, Juan Pedro |
| Melly, Domhnall |
| Mendes-Filho, Luiz |
| Michopoulou, Elina |
| Mihalic, Tanja |
| Milman, Ady |
| Minghetti, Valeria |
| Mitchell, David |
| Mohammad Shafiee, Majid |
| Mohammad, Jihad |
| Mohammadi, Fatemeh |
| Mohammed, Amal |
| Molina-Collado, Arturo |
| Molinillo, Sebastián |
| Moon, Jang-Won |
| Moorthy, Krishna |
| Moreno-Izquierdo, Luis |
| Morrison, Alastair |
| Muler Gonzalez, Vanessa |
| Munne, Manzuma Sharmin |
| Musanovic, Jelena |
| Mwesiumo, Deodat |
| Mytaftsi, Ioanna |
| Nasri Katman, Muhammad |
| Nazneen, Shama |
| Ndou, Valentina |
| Neuhofer, Barbara |
| Ngan, Henrique |
| Nguyen, Mai |
| Nicolau, Juan Luis |
| Nikraftar, Tayebeh |
| Nuryanti, Wiendu |
| O' Regan, Michael |
| O'Connor, Peter |
| Oktadiana, Hera |
| Okumus, Bendegul |
| Omar, Shida |
| Osman, Hanaa |
| Ostrovskaya, Liudmila |
| Özturk Çiftci, Didem |
| Pak, Ka Ying |
| Papathanassis, Alexis |
| Papatheodorou, Andreas |
| Paraskevas, Alexandros |
| Park, Eunhye (Olivia) |
| Park, Jinah |
| Pechlaner, Harald |
| Pehin Dato Musa, Siti |
| Pérez Sánchez, Maria de los Angeles |
| Pérez-Cabanero, Carmen |
| Perles Ribes, Jose Francisco |
| Pesonen, Juho |
| Peters, Mike |
| Pforr, Christof |
| Phuah, Kit Teng |
| Pi-Shen, Ku |
| Pimentel, Pedro |
| Poria, Yaniv |
| Pozzi, Andrea |
| Pratt, Stephen |
| Prentice, Catherine |
| Prideaux, Bruce |
| Pu, Bo |
| Qian, Lili |
| Qiu, Richard |
| Rahmafitria, Fitri |
| Ram, Yael |
| Ramos, Vicente |
| Rasoolimanesh, S. Mostafa |
| Rastegar, Raymond |
| Richards, Greg |
| Rihova, Ivana |
| Romero, Jaime |
| Rosenbaum, Mark |
| Roumiani, Ahmad |
| Ruan, Wen-Qi |
| Rubio, Lucia |
| Rucci, Ana Clara |
| Ruhanen, Lisa |
| Ruiz-Alba, José L. |
| Salem, Islam |
| Sánchez-Sánchez, Francisca J. |
| Sang, Hongli |
| Santos, Vasco |
| Saralegui, Tomás |
| Schweinsberg, Stephen |
| Scott, Noel |
| Seetanah, Boopen |
| Seetaram, Neelu |
| Segovia, Mónica |
| Seyfi, Siamak |
| Seyitoğlu, Faruk |
| Shah, Syed Alamdar Ali |
| Shang, Kaiti |
| Shapoval, Valeriya |
| Sharma, Kamakshi |
| Sharpley, Richard |
| Shehawy, Yasser Moustafa |
| Shen, Ke |
| Shen, Weili |
| Sheng-Hshiung, Tsaur |
| Shi, Huike |
| Shie, An-Jin |
| Shome, Samik |
| Siddiqi, Umar |
| Sigala, Marianna |
| sobihah, mutia |
| Sofyan, Andi |
| Sofyan, Syaakir |
| Sojasi Qeidari, Hamdollah |
| Solakis, Konstantinos |
| Soldić Frleta, Daniela |
| Soleimani, Samaneh |
| Soltani, Morteza |
| Song, Baoyi |
| Song, Haiyan |
| Song, Youkai |
| Sorrentino, Annarita |
| Spanou, Elena |
| Spenceley, Anna |
| Spencer, Andrew |
| Steiger, Robert |
| Stergiou, Dimitrios |
| Stettler, Jürg |
| Sthapit, Erose |
| Stierand, Marc |
| Stoyanova-Bozhkova, Svetla |
| Stylos, Nikolaos |
| Su, Zhaohui |
| Suk, Minho |
| Suki, Norazah Mohd |
| Sun, Ning |
| Sun, Sunny |
| Suryadi, Karim |
| Tajeddini, Kayhan |
| Talón-Ballestero, Pilar |
| Tam, Nguyen |
| Tan Wei Han, Garry |
| Tan, Kim Lim |
| Tasci, Asli |
| Taşçıoğlu, Mertcan |
| Teitler Regev, Sharon |
| Teixeira, Joao |
| Teixeira, Sergio |
| Telfer, David |
| Težak Damijanić, Ana |
| Tham, Aaron |
| Thawornwiriyatrakul , Warangkana |
| Thieme, Juliane |
| Tiago, Flavio |
| Tiago, Maria Teresa |
| Tiwari, Aviral |
| Tolkach, Denis |
| Tran , Vinh |
| Tran, Lobel Trong Thuy |
| Tran, Phuong |
| Tsungpao, Wu |
| Ud Din, Nizam |
| Usman, Muhammad |
| Vada, Sera |
| Valeri, Marco |
| Valeri, Marco |
| van Teijlingen, Edwin |
| Vašaničová, Petra |
| Veloutsou, Cleopatra |
| Verma, Sanjeev |
| Viglia, Giampaolo |
| Vizcaino-Suárez, Laura Paola |
| Volchek, Katerina |
| Volgger, Michael |
| Wada, Elizabeth Kyoko |
| Wall, Geoffrey |
| Walmsley, Andreas |
| Walters, Gabby |
| Wan, Chunlin |
| Wan, Yim King Penny |
| Wang, Dan |
| Wang, Jinwei |
| Wang, Lei |
| Wang, Sha |
| Wang, Weixuan |
| Wang, Xinrui |
| Wang, Yao-Chin |
| Ward, Aisling |
| Wasay, Allah |
| Wattanacharoensil, Walanchalee |
| Webster, Craig |
| Wen, Jun |
| Williams, Nigel |
| Williams, Peter |
| Winardi, Michael |
| Wittmer, Andreas |
| Wong, Jose WengChou |
| Woyo, Elisha |
| Wu, Hui |
| Wu, Hung-Che |
| Xi, Fang |
| Xiang, Zheng |
| Xie, Chaowu |
| Xu, Feifei |
| Xu, Hong |
| Yan, Libo |
| Yang, Elaine |
| Yang, Shaohua |
| Yu, Joanne |
| Zaman, Syed Imran |
| Zeidan, Susan |
| Zelenka, Josef |
| Zemla, Michal |
| Zhang, Carol |
| Zhang, Hongmei |
| Zhang, Jiekuan |
| Zhang, Jinyi |
| Zhang, Kun |
| Zhang, Mann |
| Zhang, Mu |
| Zhang, Wen |
| Zhong, Lina |
| Zhu, Hong |
| Zhu, Nina |
| Zins, Andreas |
| Zmyslony, Piotr |
| Zou, Yong-guang |