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Open-Access Journal
Evidence Review
Steve M D'Souza, Kevin Houston, Lauren Keenan, Byung Soo Yoo, Parth J Parekh, David A Johnson 
World J Gastroenterol 27(18):2054-2072. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2054
Review
Roman Maslennikov, Vladimir Ivashkin, Irina Efremova, Elena Shirokova 
World J Gastroenterol 27(18):2073-2089. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2073
Minireviews
Ashish Kumar Jha, Gaurav Kumar, Vishwa Mohan Dayal, Abhay Ranjan, Arya Suchismita 
World J Gastroenterol 27(18):2090-2104. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2090
Faran Polani, Patrick M Grierson, Kian-Huat Lim 
World J Gastroenterol 27(18):2105-2121. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2105
Pei-Pei Wang, Chao-Lin Deng, Bin Wu 
World J Gastroenterol 27(18):2122-2130. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2122
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
Xiao-Xin Zhang, Hao-Yang Wang, Xue-Fei Yang, Zi-Qi Lin, Na Shi, Chan-Juan Chen, Lin-Bo Yao, Xin-Min Yang, Jia Guo, Qing Xia, Ping Xue 
World J Gastroenterol 27(18):2141-2159. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2141
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
Chang Seok Ko, Nam Ryong Choi, Byung Sik Kim, Jeong Hwan Yook, Min-Ju Kim, Beom Su Kim 
World J Gastroenterol 27(18):2193-2204. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2193
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
Magdy El-Salhy, Christina Casen, Jørgen Valeur, Trygve Hausken, Jan Gunnar Hatlebakk 
World J Gastroenterol 27(18):2219-2237. Published online May 14, 2021. doi: 10.3748/wjg.v27.i18.2219
Observational Study
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