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Open-Access Journal
Opinion Review
Review
Minireviews
Timothy N Archampong, Richard H Asmah, Cathy J Richards, Vicki J Martin, Christopher D Bayliss, Edília Botão, Leonor David, Sandra Beleza, Carla Carrilho 
World J Gastroenterol 25(26):3344-3358. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3344
Basic Study
Retrospective Study
Observational Study
Systematic Reviews
Dimitrios Papaconstantinou, Diamantis I Tsilimigras, Dimitrios Moris, Adamantios Michalinos, Aikaterini Mastoraki, Efstratia Mpaili, Natasha Hasemaki, Anargyros Bakopoulos, Dimitrios Filippou, Dimitrios Schizas 
World J Gastroenterol 25(26):3438-3449. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3438
Meta-Analysis