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Open-Access Journal
Minireviews
Basic Study
Retrospective Study
Clinical Trials Study
Peter Deibert, Adhara Lazaro, Denise Schaffner, Aloys Berg, Daniel Koenig, Wolfgang Kreisel, Manfred W Baumstark, Daniel Steinmann, Martin Buechert, Thomas Lange 
World J Gastroenterol 25(9):1116-1131. Published online Mar 7, 2019. doi: 10.3748/wjg.v25.i9.1116
Observational Study
Systematic Reviews
Adérson Omar Mourão Cintra Damião, Matheus Freitas Cardoso de Azevedo, Alexandre de Sousa Carlos, Marcela Yumi Wada, Taciana Valéria Marcolino Silva, Flávio de Castro Feitosa 
World J Gastroenterol 25(9):1142-1157. Published online Mar 7, 2019. doi: 10.3748/wjg.v25.i9.1142
Meta-Analysis