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Open-Access Journal
Opinion Review
Review
Minireviews
Matteo Renzulli, Alfredo Clemente, Francesco Tovoli, Salvatore Cappabianca, Luigi Bolondi, Rita Golfieri 
World J Gastroenterol 25(20):2442-2449. Published online May 28, 2019. doi: 10.3748/wjg.v25.i20.2442
Basic Study
Case Control Study
Retrospective Study
Observational Study
Takeshi Yokoo, Tsutomu Kanefuji, Takeshi Suda, Itsuo Nagayama, Takahiro Hoshi, Satoshi Abe, Shinichi Morita, Hiroteru Kamimura, Kenya Kamimura, Atsunori Tsuchiya, Masaaki Takamura, Kazuyoshi Yagi, Shuji Terai 
World J Gastroenterol 25(20):2503-2513. Published online May 28, 2019. doi: 10.3748/wjg.v25.i20.2503
Systematic Reviews