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Open-Access Journal
Editorial
Review
Basic Study
Case Control Study
Retrospective Study
Shinichi Takano, Mitsuharu Fukasawa, Makoto Kadokura, Hiroko Shindo, Ei Takahashi, Sumio Hirose, Yoshimitsu Fukasawa, Satoshi Kawakami, Tadashi Sato, Nobuyuki Enomoto 
World J Gastroenterol 23(18):3295-3300. Published online May 14, 2017. doi: 10.3748/wjg.v23.i18.3295
Observational Study
Nalinee Srisarajivakul, Catherine Lucero, Xiao-Jing Wang, Michael Poles, Colleen Gillespie, Sondra Zabar, Elizabeth Weinshel, Lisa Malter 
World J Gastroenterol 23(18):3315-3321. Published online May 14, 2017. doi: 10.3748/wjg.v23.i18.3315
Prospective Study
Randomized Controlled Trial
Evidence-Based Medicine
Case Report