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Open-Access Journal
Opinion Review
Gennaro Nappo, Greta Donisi, Alessandro Zerbi 
World J Gastrointest Surg 13(6):516-528. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.516
Minireviews
Cosmas Rinaldi Adithya Lesmana, Maria Satya Paramitha, Rino Alvani Gani 
World J Gastrointest Surg 13(6):537-547. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.537
Beata Jabłońska, Marek Olakowski, Sławomir Mrowiec 
World J Gastrointest Surg 13(6):548-562. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.548
Basic Study
Mitsuru Esaki, Eikichi Ihara, Norikazu Hashimoto, Shuichi Abe, Chihoko Aratono, Noriko Shiga, Yorinobu Sumida, Hiroyuki Fujii, Kazuhiro Haraguchi, Shunsuke Takahashi, Tsutomu Iwasa, Kayoko Nakano, Masafumi Wada, Shinichi Somada, Kei Nishioka, Yosuke Minoda, Haruei Ogino, Yoshihiro Ogawa 
World J Gastrointest Surg 13(6):563-573. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.563
Systematic Reviews
Tiago Correia de Sá, Carlos Soares, Mónica Rocha 
World J Gastrointest Surg 13(6):574-584. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.574
Zi Qin Ng, Margaret Han, Han Nien Beh, Simon Keelan 
World J Gastrointest Surg 13(6):585-596. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.585
Gianluca Costa, Pietro Fransvea, Luca Lepre, Fabio Rondelli, Alessandro Costa, Michela Campanelli, Giorgio Lisi, Maria Rosaria Mastrangeli, Giovanni Guglielmo Laracca, Giovanni Maria Garbarino, Graziano Ceccarelli 
World J Gastrointest Surg 13(6):597-619. Published online Jun 27, 2021. doi: 10.4240/wjgs.v13.i6.597
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