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Editorial
Opinion Review
Review
Roberta Elisa Rossi, Alessandra Elvevi, Davide Citterio, Jorgelina Coppa, Pietro Invernizzi, Vincenzo Mazzaferro, Sara Massironi 
World J Gastroenterol 27(35):5890-5907. Published online Sep 21, 2021. doi: 10.3748/wjg.v27.i35.5890
Minireviews
Sara Cococcia, Marco Vincenzo Lenti, Giovanni Santacroce, Giovanna Achilli, Federica Borrelli de Andreis, Antonio Di Sabatino 
World J Gastroenterol 27(35):5919-5931. Published online Sep 21, 2021. doi: 10.3748/wjg.v27.i35.5919
Basic Study
Retrospective Study
Zhen-Zhen Wang, Xian-Bin Zhou, Yi Wang, Xin-Li Mao, Li-Ping Ye, Ling-Ling Yan, Ya-Hong Chen, Ya-Qi Song, Yue Cai, Shi-Wen Xu, Shao-Wei Li 
World J Gastroenterol 27(35):5958-5966. Published online Sep 21, 2021. doi: 10.3748/wjg.v27.i35.5958
Róbert Stollmayer, Bettina K Budai, Ambrus Tóth, Ildikó Kalina, Erika Hartmann, Péter Szoldán, Viktor Bérczi, Pál Maurovich-Horvat, Pál N Kaposi 
World J Gastroenterol 27(35):5978-5988. Published online Sep 21, 2021. doi: 10.3748/wjg.v27.i35.5978