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Open-Access Journal
Opinion 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
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