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Open-Access Journal
Retrospective Study
Observational Study
Osamu Toyoshima, Toshihiro Nishizawa, Shuntaro Yoshida, Tomonori Aoki, Fumiko Nagura, Kosuke Sakitani, Yosuke Tsuji, Hayato Nakagawa, Hidekazu Suzuki, Kazuhiko Koike 
World J Gastrointest Endosc 13(5):125-136. Published online May 16, 2021. doi: 10.4253/wjge.v13.i5.125
Meta-Analysis
Case Report
Alexander A Smirnov, Maya M Kiriltseva, Mariya E Lyubchenko, Vladimir D Nazarov, Anna V Botina, Aleksandr N Burakov, Sergey V Lapin 
World J Gastrointest Endosc 13(5):155-160. Published online May 16, 2021. doi: 10.4253/wjge.v13.i5.155