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Open-Access Journal
Opinion Review
Review
Minireviews
Basic Study
Marwa Matboli, Amany H Hasanin, Reham Hussein, Sarah El-Nakeep, Eman K Habib, Rawan Ellackany, Lobna A Saleh 
World J Gastroenterol 27(14):1435-1450. Published online Apr 14, 2021. doi: 10.3748/wjg.v27.i14.1435
Retrospective Cohort Study
Sarah A Malik, Chencan Zhu, Jinyu Li, Joseph F LaComb, Paula I Denoya, Igor Kravets, Joshua D Miller, Jie Yang, Melissa Kramer, W Richard McCombie, Charles E Robertson, Daniel N Frank, Ellen Li 
World J Gastroenterol 27(14):1465-1482. Published online Apr 14, 2021. doi: 10.3748/wjg.v27.i14.1465
Retrospective Study
Aleksandra Glapa-Nowak, Mariusz Szczepanik, Barbara Iwańczak, Jarosław Kwiecień, Anna Barbara Szaflarska-Popławska, Urszula Grzybowska-Chlebowczyk, Marcin Osiecki, Marcin Dziekiewicz, Andrzej Stawarski, Jarosław Kierkuś, Tomasz Banasiewicz, Aleksandra Banaszkiewicz, Jarosław Walkowiak 
World J Gastroenterol 27(14):1483-1496. Published online Apr 14, 2021. doi: 10.3748/wjg.v27.i14.1483
Observational Study
Meta-Analysis