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Open-Access Journal
Frontier
Review
Yu-Jer Hsiao, Yuan-Chih Wen, Wei-Yi Lai, Yi-Ying Lin, Yi-Ping Yang, Yueh Chien, Aliaksandr A Yarmishyn, De-Kuang Hwang, Tai-Chi Lin, Yun-Chia Chang, Ting-Yi Lin, Kao-Jung Chang, Shih-Hwa Chiou, Ying-Chun Jheng 
World J Gastroenterol 27(22):2979-2993. Published online Jun 14, 2021. doi: 10.3748/wjg.v27.i22.2979
Minireviews
Anna Di Sessa, Francesca Lanzaro, Sarah Zarrilli, Vittorio Picone, Stefano Guarino, Emanuele Miraglia del Giudice, Pierluigi Marzuillo 
World J Gastroenterol 27(22):3064-3072. Published online Jun 14, 2021. doi: 10.3748/wjg.v27.i22.3064
Basic Study
Retrospective Study
Observational Study
Prospective Study
Verena Zerbato, Stefano Di Bella, Mauro Giuffrè, Anna Wladyslawa Jaracz, Ylenia Gobbo, Diego Luppino, Paolo Macor, Ludovica Segat, Raffaella Koncan, Pierlanfranco D'Agaro, Michael Valentini, Lory Saveria Crocé, Maurizio Ruscio, Roberto Luzzati 
World J Gastroenterol 27(22):3130-3137. Published online Jun 14, 2021. doi: 10.3748/wjg.v27.i22.3130
Correction