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Open-Access Journal
Evidence Review
Review
Minireviews
Hirokazu Saito, Yoshihiro Kadono, Takashi Shono, Kentaro Kamikawa, Atsushi Urata, Jiro Nasu, Haruo Imamura, Ikuo Matsushita, Shuji Tada 
World J Gastroenterol 27(18):2131-2140. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2131
Basic Study
Shun Takayama, Kazuhiro Katada, Tomohisa Takagi, Takaya Iida, Tomohiro Ueda, Katsura Mizushima, Yasuki Higashimura, Mayuko Morita, Tetsuya Okayama, Kazuhiro Kamada, Kazuhiko Uchiyama, Osamu Handa, Takeshi Ishikawa, Zenta Yasukawa, Tsutomu Okubo, Yoshito Itoh, Yuji Naito 
World J Gastroenterol 27(18):2160-2176. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2160
Retrospective Cohort Study
Ewa Janczewska, Mateusz Franciszek Kołek, Beata Lorenc, Jakub Klapaczyński, Magdalena Tudrujek-Zdunek, Marek Sitko, Włodzimierz Mazur, Dorota Zarębska-Michaluk, Iwona Buczyńska, Dorota Dybowska, Agnieszka Czauż-Andrzejuk, Hanna Berak, Rafał Krygier, Jerzy Jaroszewicz, Jolanta Citko, Anna Piekarska, Beata Dobracka, Łukasz Socha, Zbigniew Deroń, Łukasz Laurans, Jolanta Białkowska-Warzecha, Olga Tronina, Brygida Adamek, Krzysztof Tomasiewicz, Krzysztof Simon, Malgorzata Pawłowska, Waldemar Halota, Robert Flisiak 
World J Gastroenterol 27(18):2177-2192. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2177
Retrospective Study
Maria Conticchio, Riccardo Inchingolo, Antonella Delvecchio, Letizia Laera, Francesca Ratti, Maximiliano Gelli, Ferdinando Anelli, Alexis Laurent, Giulio Vitali, Paolo Magistri, Giacomo Assirati, Emanuele Felli, Taiga Wakabayashi, Patrick Pessaux, Tullio Piardi, Fabrizio di Benedetto, Nicola de'Angelis, Javier Briceño, Antonio Rampoldi, Renè Adam, Daniel Cherqui, Luca Antonio Aldrighetti, Riccardo Memeo 
World J Gastroenterol 27(18):2205-2218. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2205
Clinical Trials Study
Observational Study