^○Hironobu Nagumo¹, Kotaro Ichihara², Satoshi Adachi³ (1.Dept. of Gastroenterology, Gyoda General Hospital, Saitama, Japan, 2.Higashiomiya General Hospital, Saitama, Japan, 3.Tokatsu Hospital, Chiba, Japan)

^○Yoshihiro Yokoi¹, Masataka Kikuyama², Takeshi Kaneko¹ (1.Dept. of Surgery, Shinshiro Municipal Hospital, Shinshiro, Japan, 2.Shizuoka General Hospital, Shizuoka, Japan)

^○Tsukasa Yoshida¹, Kazuo Hara¹, Nobumasa Mizuno¹, Susumu Hijioka¹, Hiroshi Imaoka¹, Masahiro Tajika², Tsutomu Tanaka², Makoto Ishihara², Tatsuji Yogi¹, Eiji Tsutsumi¹, Toshihisa Fujiyoshi¹, Takamitsu Sato¹, Nobuhiro Hieda¹, Nozomi Okuno¹, Yasumasa Niwa², Kenji Yamao¹ (1.Dept. of Gastroenterology,Aichi Cancer Center Central Hospital,Aichi,Japan, 2.Dept. of Endoscopy, Aichi Cancer Center Central Hospital,Aichi,Japan)

^○Yoshiaki Kawaguchi, Yohei Kawashima, Atsuko Maruno, Masami Ogawa, Tetsuya Mine (Dept. of Gastroenterology, Sch. of Med. Tokai Univ., Isehara, Japan)

^○Takahiro Ajihara, Junichi Akao, Yukiko Takayama, Tomoko Kaise, Tarou Shioga, Kenta Nagao, Junko Tahara, Kyoko Shimizu, keiko shiratori (Dept. of Gastroenterology. Tokyo Women'S Medical University. Tokyo, Japan)