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Open-Access Journal
Opinion Review
Review
Pier Paolo Mainenti, Arnaldo Stanzione, Salvatore Guarino, Valeria Romeo, Lorenzo Ugga, Federica Romano, Giovanni Storto, Simone Maurea, Arturo Brunetti 
World J Gastroenterol 25(35):5233-5256. Published online Sep 21, 2019. doi: 10.3748/wjg.v25.i35.5233
Minireviews
Basic Study
Case Control Study
Retrospective Study
Sadayuki Kawai, Tadakazu Shimoda, Takashi Nakajima, Masanori Terashima, Katsuhiro Omae, Nozomu Machida, Hirofumi Yasui 
World J Gastroenterol 25(35):5334-5343. Published online Sep 21, 2019. doi: 10.3748/wjg.v25.i35.5334
Systematic Reviews
Tommaso Maria Manzia, Roberta Angelico, Carlo Gazia, Ilaria Lenci, Martina Milana, Oludamilola T Ademoyero, Domiziana Pedini, Luca Toti, Marco Spada, Giuseppe Tisone, Leonardo Baiocchi 
World J Gastroenterol 25(35):5356-5375. Published online Sep 21, 2019. doi: 10.3748/wjg.v25.i35.5356
Meta-Analysis
Case Report