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Open-Access Journal
Opinion Review
Review
Olorunseun O Ogunwobi, Trisheena Harricharran, Jeannette Huaman, Anna Galuza, Oluwatoyin Odumuwagun, Yin Tan, Grace X Ma, Minhhuyen T Nguyen 
World J Gastroenterol 25(19):2279-2293. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2279
Minireviews
Basic Study
Case Control Study
Retrospective Study
Observational Study
Elisa Sollelis, Régine Minet Quinard, Guillaume Bouguen, Marion Goutte, Félix Goutorbe, Damien Bouvier, Bruno Pereira, Gilles Bommelaer, Anthony Buisson 
World J Gastroenterol 25(19):2354-2364. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2354
Prospective Study
Randomized Controlled Trial
Meta-Analysis