^○Akihiko Murakami¹, Iichiro Akasaka¹, yoshihiko Amano², manami Miura¹, Taro Takahashi¹, Atsushi Ikehata², osamu Kido², Noriyuki Obara², shinji Saito³, Yuko Sugawara³ (1.Div. of Endoscopy, Iwate Prefectural Central Hospital .,Iwate ,Japan, 2.Div. of gasroenterology Iwate prefectural central hospital. ,IWATE, japan, 3.Div. of gasroenterology Iwate prefectural miyako hospital .,IWATE, japan)

^○Takahiro Sato¹, Shinichi Hayashi¹, Hideyuki Shimizu¹, Yoshiaki Harada¹, Masayoshi Harada¹, Shigeki Yamaguchi², Isamu Koyama² (1.Dept. of Gastroenterological Surgery, Iruma, Saitama, Japan, 2.Saitama International Medical Center, Hidaka, Saitama, Japan)

^○Ayako Watanabe¹, Masayuki Ando², Junnosuke Hayasaka¹, Kentaro Takagi¹, Eiko Okamoto¹, Akiko Kitazume¹, Atsushi Tamura¹, Mayumi Kondo¹ (1.Dept. of Gastroenterology and Hepatology.Toshima Hospital. Tokyo .Japan, 2.Department of surgery.Toshima Hospital .Tokyo. Japan)

^○Kazuo Nagura¹, Yuji Takahash¹, Takehiko Sugie¹, Kengo Ogawa¹, Tomomichi Matushita¹, Yoichirou Ito¹, Testuya Yamada² (1.Dept. of Gastroenterology, Gifu Red Cross Hospital., Gifu, Japan, 2.Kizawa Hospital,Minokamo,Japan)

^○Ryo Yamashita, Jun Nishida, Akimitsu Tadauchi, Akira Yamada, Naotaka Nakama, Nozomi Kubota, Yoshihisa Sato, Sayo Tani (Seirei Mikatahara General Hospital, Tokyo, Japan)