^○Masaya Uesato, Yorihiko Mutou, Hisahiro Matsubara (Dept. of Frontier Surgery, Sch. of Med. Chiba Univ., Chiba, Japan)

^○Yoshinori Mizumoto, Naoki Esaka, Shinji Katsushima (Dept. of Gastroenterology, National Hospital Organization Kyoto Medical Center, Kyoto, Japan)

^○Hiroyasu Iwasaki, Takashi Mizushima, Hitoshi Sano (Dept. of Gastroenterology, Gifu Prefectural Tajimi Hospital, Gifu, Japan)

^○Naminatsu Takahara, Hiroyuki Isayama, Kazuhiko Koike (Depertment of Gastroenterology, The University of Tokyo, Japan)

^○Kazuya Matsumoto^1,4, Hironari Kato^2,4, Hirofumi Kawamoto^3,4 (1.Dept. of Gastroenterology, Tottori Univ., Yonago, Japan, 2.Dept. of Gastroenterology and Hepatology, Okayama Univ. Sch. of Med., Okayama, Japan, 3.Dept. of General Internal Medicine 2, Kawasaki Sch. of Med., Okayama, Japan)

^○Yuji Nishi, Katsuyuki Miyabe, Takahiro Nakazawa (Dept. of Gastroenterology and Metabolism,Nagoya City University Graduate School of Medical Sciences,Nagoya,Japan)

^○Hironori Masutani, Mitsuhiro Kida, Wasaburo Koizumi (Dept. of Gastroenterology, Kitasato University School of Medicine, Kanagawa, Japan)

^○Takeshi Ogura, Tatsushi Sano, Kazuhide Higuchi (Second Dept. of Internal Medicine, Osaka Medical College, Japan)

^○Hirofumi Kiyokawa, Kazunari Nakahara, FUMIO Ito (Dep. of Gastroenterology and Hepatology, St. Marianna Univ., Sch. of Med, Kawasaki, Japan)

^○Yorinobu Sumida¹, Hiroyuki Isayama², Yoshihisa Saida³ (1.Dept. of Gastroenterology,Clinical Research Institute, Kyushu Medical Center, Fukuoka, Japan, 2.Dept. of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan, 3.Dept. of Surgery, Toho University Ohashi Medical Center)

^○tatsuya Fujimoto, Ryosaku Azemoto, Takashi Kaiho (Dept. of Gastroenterology, Kimitsu Chuo Hospital, Kisarazu City, Chiba, Japan)

^○Hideki Kanazawa^1,4, Shuji Saito^2,4, Yoshihisa Saida^3,4 (1.Dept. of Surgery, National Hospital Organization Sagamihara Hospital, Japan, 2.Department of Surgery, National Hospital Organization Yokohama Medical Center, 3.Department of Surgery, Toho University Ohashi Medical Center, 4.Colonic Stent Safe Procedure Research Group)

^○Taku Tabata¹, Koichi Koizumi², Keiichi Takahashi³ (1.Dept. of Endoscopy, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan, 2.Department of Gastroenterology, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan, 3.Department of Surgery, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan)

^○Satoshi Ogawa, Kosuke Minaga, Yukitaka Yamashita (Dept. of Gastroenterology, Japanese Red Cross Wakayama Medical Center, Wakayama, Japan)