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Open-Access Journal
Minireviews
Retrospective Study
Mitchell L Ramsey, Lindsay A Sobotka, Somashekar G Krishna, Alice Hinton, Stephen E Kirkby, Susan S Li, Michael P Meara, Darwin L Conwell, Peter P Stanich 
World J Gastrointest Endosc 13(9):371-381. Published online Sep 16, 2021. doi: 10.4253/wjge.v13.i9.371
Observational Study
Ioannis S Papanikolaou, Georgios Tziatzios, Alexandros Chatzidakis, Antonio Facciorusso, Stefano Francesco Crinò, Paraskevas Gkolfakis, Gjorgi Deriban, Mario Tadic, Goran Hauser, Antonios Vezakis, Ivan Jovanovic, Nicola Muscatiello, Anna Meneghetti, Konstantinos Miltiadou, Kalina Stardelova, Alojzije Lacković, Maria-Zoi Bourou, Srdjan Djuranovic, Konstantinos Triantafyllou 
World J Gastrointest Endosc 13(9):416-425. Published online Sep 16, 2021. doi: 10.4253/wjge.v13.i9.416
Osamu Toyoshima, Shuntaro Yoshida, Toshihiro Nishizawa, Akira Toyoshima, Kosuke Sakitani, Tatsuya Matsuno, Tomoharu Yamada, Takashi Matsuo, Hayato Nakagawa, Kazuhiko Koike 
World J Gastrointest Endosc 13(9):426-436. Published online Sep 16, 2021. doi: 10.4253/wjge.v13.i9.426
Case Report
Letter to the Editor