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Open-Access Journal
Editorial
Review
Minireviews
Basic Study
Case Control Study
Retrospective Cohort Study
Retrospective Study
Yuji Sakai, Tomohisa Iwai, Kenji Shimura, Katsushige Gon, Kazuya Koizumi, Masashi Ijima, Kazuro Chiba, Seigo Nakatani, Harutoshi Sugiyama, Toshio Tsuyuguchi, Terumi Kamisawa, Iruru Maetani, Mitsuhiro Kida 
World J Gastroenterol 24(1):69-75. Published online Jan 7, 2018. doi: 10.3748/wjg.v24.i1.69
Observational Study
Marta Maia Bosca-Watts, Miguel Minguez, Dolores Planelles, Samuel Navarro, Alejandro Rodriguez, Jesus Santiago, Joan Tosca, Francisco Mora 
World J Gastroenterol 24(1):96-103. Published online Jan 7, 2018. doi: 10.3748/wjg.v24.i1.96
Prospective Study
Systematic Reviews
Meta-Analysis
Case Report