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Hiroki Fujikawa, Toshio Kuwai, Toshiki Yamaguchi, Ryoichi Miura, Yuki Sumida, Takeshi Takasago, Yuki Miyasako, Tomoyuki Nishimura, Sumio Iio, Hiroki Imagawa, Atsushi Yamaguchi, Hirotaka Kouno, Hiroshi Kohno 
World J Gastrointest Endosc 10(3):69-73. Published online Mar 16, 2018. doi: 10.4253/wjge.v10.i3.69