Colorectal endoscopic submucosal dissection can be efficiently performed by a trainee with use of a simple traction device and expert supervision by Daisuke Ide, Shoichi Saito, Tomohiko Richard Ohya, Yuske Nishikawa, Yoshimasa Horie, Chihiro Yasue, Akiko Chino, Masahiro Igarashi, Masayuki Saruta, Junko Fujisaki

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