^○Takahashi Yoshifumi¹, Kenichi Mizuno², Masaaki Kobayashi², Kazuya Takahashi¹, Nishigaki Yu-ki¹, Kazunao Hayashi², Takashi Yamamoto², Honda Yutaka², Satoru Hashimoto², Junji Yokoyama¹, Manabu Takeuchi¹, Yuichi Sato¹, Shuji Terai¹ (1.Div. of Gastroenterology & Hepatology, Graduate School of Medical & Dental Sciences, Niigata University,Niigata,Japan, 2.Department of Endoscopy,Niigata University Medical & Dental Hospital,Niigata,Japan)

^○Keita Harada¹, Hiroyuki Okada¹, Shiho Takashima², Daisuke Takei², Toshihiro Inokuchi², Asuka Nakarai², Yusaku Sugihara², Masahiro Takahara², Seiji Kawano¹, Sakiko Hiraoka², Yoshiro Kawahara¹, Yoshitaka Kondo³, Kazuhide Yamamoto¹ (1.Okayama University Hospital, Div. of Endoscopy, Okayama, Japan, 2.Okayama University Hospital, Dept. of Gastroenterology, Okayama, Japan, 3.Okayama University Hospital, Dept. of Gastroenterological Surgery, Okayama, Japan)

^○Mitsuru Esaki¹, Shinichi Tsuruta¹, Haruei Ogino¹, Shuntaro Nagai², Yoshitaka Tanabe², Hirotada Akiho¹ (1.Dept. of Gastrointestinal Medicine, Kitakyushu City Medical Center., Fukuoka, Japan, 2.Dept. of Surgery, Kitakyushu City Medical center., Fukuoka, Japan)

^○Kazuo Arii¹, Yoshimasa Oku¹, Tadashi Kontani¹, Kazuya Yamaguchi¹, Izumi Nishikawa², Hideya Maeshima², Katsuhiko Higashi² (1.Dept. of Gastroenterological Surgery, Hidaka General Hospital, Japan, 2.1st. Dept. of Internal medicine, Hidaka General Hospital)

^○Yasuyuki Nishida, Yuchi Motohuji, Kenichiro Tsukada, Takurou Sawasaki, Kouhei Ogawa, Hitoshi Kunitani, Nobuyuki Hirai, Mitsuhiro Terada (Dept. of Gastroenterological Medicine, Kouseiren Takaoka Hospital, Toyama, Japan)