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Open-Access Journal
Evidence Review
Sara Cherri, Silvia Noventa, Alberto Zaniboni 
World J Gastroenterol 27(17):1847-1863. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1847
Review
Rajiv Heda, Masahiko Yazawa, Michelle Shi, Madhu Bhaskaran, Fuad Zain Aloor, Paul J Thuluvath, Sanjaya K Satapathy 
World J Gastroenterol 27(17):1864-1882. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1864
Ademar Dantas Cunha Júnior, Arinilda Campos Bragagnoli, Felipe Osório Costa, José Barreto Campello Carvalheira 
World J Gastroenterol 27(17):1883-1904. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1883
Cinzia Maria Chinnici, Giovanna Russelli, Matteo Bulati, Vitale Miceli, Alessia Gallo, Rosalia Busà, Rosaria Tinnirello, Pier Giulio Conaldi, Gioacchin Iannolo 
World J Gastroenterol 27(17):1905-1919. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1905
Minireviews
John Gubatan, Steven Levitte, Akshar Patel, Tatiana Balabanis, Mike T Wei, Sidhartha R Sinha 
World J Gastroenterol 27(17):1920-1935. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1920
Michael N Rosen, Rachel A Goodwin, Michael M Vickers 
World J Gastroenterol 27(17):1943-1958. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1943
Mohamed Shengir, Mohamed Elgara, Giada Sebastiani 
World J Gastroenterol 27(17):1959-1972. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1959
Basic Study
Bin Wang, Xing Sun, Ke-Jian Huang, Li-Sheng Zhou, Zheng-Jun Qiu 
World J Gastroenterol 27(17):1993-2014. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.1993
Retrospective Study
Peng Liu, Xian-Zhen Tan, Ting Zhang, Qian-Biao Gu, Xian-Hai Mao, Yan-Chun Li, Ya-Qiong He 
World J Gastroenterol 27(17):2015-2024. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.2015
Observational Study
Trond Espen Detlie, Jonas Christoffer Lindstrøm, Marte Eide Jahnsen, Elisabeth Finnes, Heinz Zoller, Bjørn Moum, Jørgen Jahnsen 
World J Gastroenterol 27(17):2039-2053. Published online May 7, 2021. doi: 10.3748/wjg.v27.i17.2039
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