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Open-Access Journal
Opinion Review
Kirpal Panacer, Peter J Whorwell 
World J Gastroenterol 25(24):2973-2976. Published online Jun 28, 2019. doi: 10.3748/wjg.v25.i24.2973
Review
Ka-Shing Cheung, Wai K Leung, Wai-Kay Seto 
World J Gastroenterol 25(24):2990-3008. Published online Jun 28, 2019. doi: 10.3748/wjg.v25.i24.2990
Minireviews
Koichi Hayano, Gaku Ohira, Atsushi Hirata, Tomoyoshi Aoyagi, Shunsuke Imanishi, Toru Tochigi, Toshiharu Hanaoka, Kiyohiko Shuto, Hisahiro Matsubara 
World J Gastroenterol 25(24):3021-3029. Published online Jun 28, 2019. doi: 10.3748/wjg.v25.i24.3021
Basic Study
Retrospective Study
Yugo Iwaya, Yuto Shimamura, Kenichi Goda, Enrique Rodríguez de Santiago, John Gerard Coneys, Jeffrey D Mosko, Gabor Kandel, Paul Kortan, Gary May, Norman Marcon, Christopher Teshima 
World J Gastroenterol 25(24):3069-3078. Published online Jun 28, 2019. doi: 10.3748/wjg.v25.i24.3069
Observational Study
Systematic Reviews