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Open-Access Journal
Frontier
Review
Xing-Yu Liu, Chuan-Hao Guo, Zhi-Yuan Xi, Xin-Qi Xu, Qing-Yang Zhao, Li-Sha Li, Ying Wang 
World J Gastroenterol 27(36):6004-6024. Published online Sep 28, 2021. doi: 10.3748/wjg.v27.i36.6004
Minireviews
Ivana Mikolasevic, Dorotea Bozic, Tajana Pavić, Alen Ruzic, Goran Hauser, Marija Radic, Delfa Radic-Kristo, Melanija Razov-Radas, Zeljko Puljiz, Sandra Milic 
World J Gastroenterol 27(36):6039-6052. Published online Sep 28, 2021. doi: 10.3748/wjg.v27.i36.6039
Basic Study
Hai-Yan Cui, Jian-Sheng Rong, Ju Chen, Jie Guo, Jia-Qin Zhu, Mei Ruan, Rong-Rong Zuo, Shuang-Shuang Zhang, Jun-Mei Qi, Bao-Hua Zhang 
World J Gastroenterol 27(36):6079-6092. Published online Sep 28, 2021. doi: 10.3748/wjg.v27.i36.6079
Case Control Study
Retrospective Study
Observational Study
Damir Alicic, Dinko Martinovic, Doris Rusic, Piero Marin Zivkovic, Ivana Tadin Hadjina, Marino Vilovic, Marko Kumric, Daria Tokic, Daniela Supe-Domic, Slaven Lupi-Ferandin, Josko Bozic 
World J Gastroenterol 27(36):6142-6153. Published online Sep 28, 2021. doi: 10.3748/wjg.v27.i36.6142
Case Report
Ismael El Hajra Martínez, Marta Calvo, José Luis Martínez-Porras, Lucia Gomez-Pimpollo Garcia, Jose L Rodriguez, Carmen Leon, José Luis Calleja Panero 
World J Gastroenterol 27(36):6154-6160. Published online Sep 28, 2021. doi: 10.3748/wjg.v27.i36.6154