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Kenji Yorita, Takehiro Iwasaki, Kunihisa Uchita, Naoto Kuroda, Koji Kojima, Shinichi Iwamura, Yutaka Tsutsumi, Akinobu Ohno, Hiroaki Kataoka 
World J Gastrointest Endosc 9(8):417-424. Published online Aug 16, 2017. doi: 10.4253/wjge.v9.i8.417