^○Toshihiko Kashiwabara, Kazuya Yoshizawa, Takashi Kon, Tomoyo Hara, Kei Kawagoe, Hideyuki Sato, Shoichiro Fujishima, Nakao Shirahata, Katsunori Suzuki, Kazutoshi Fukase, Hiroaki Takeda (Yamagata Prefectural Central Hospital, Dept. of Gastroenterology, Yamagata, Japan)

^○Yuichi Miyashima¹, Seiji Kawano², Yoshio Miyabe¹, Yoshinari Kawai¹, Toshihiro Murata³, Masashi Uda³, Hiroyuki Okada² (1.Dept. of Gastroenterology, Onomichi Municipal Hospital, Hiroshima, Japan, 2.Department of Endoscopy, Okayama University Hospital, Okayama, Japan, 3.Department of Surgery, Onomichi Municipal Hospital, Hiroshima, Japan)

^○Takahiro Umemoto, Ryuichi Sekine, Kazuhiro Kijima, Takashi Kato, Jun-ichi Tanaka (Dept. of Surgery, Showa Univ Fujigaoka Hospital., Yokohama, Japan)

^○Mitsuru Ishizuka, Hitoshi Nagata, Kazutoshi Takagi, Yoshimi Iwasaki, Norisuke Shibuya, Keiichi Kubota (Dept. of Gatroenterological Surgery, Dokkyo Medical University, Japan)

^○Kazuyoshi Yamashita (Health Administration ,Sendai Red Cross Hospital, Sendai, Japan)