^○Shingo Ito¹, Ryohei Takeda¹, Ritsuo Kokubo¹, jun Aoki², Yu Okazawa², Rina Takahashi², Kosuke Mizukosih², Masaya Kawai², Kazuhiro Takehara², Koichiro Niwa², Shun Ishiyama², Kiichi Sugimoto², Hirohiko Kamiyama², Hiromitsu Komiyama², Makoto Takahashi², Yukihiro Yaginuma², Yutaka Kojima², Michitoshi Goto², Atsushi Okuzawa², Yuichi Tomiki², Kazuhiro Sakamoto² (1.Dept. of Surgery, Yotsukaido Tokushukai Hospital., Chiba, Japan, 2.Department of Coloproctological Surgery, Faculty of Medicine, Juntendo University, Tokyo, Japan)

^○Ryo Kanazawa, Jinkan Sai, Tomoyasu Ito, Kou Tomishima, Shuichirou Shiina, sumio watanabe (Dept. of Gastroenterology Juntendo University School of Medicine Tokyo Japan)

^○Masaki Hata, Daisuke Kitamura, Eiichiro Seki, Hirofumi Gonda (Ota General Hospital , Japan)

^○Eiichiro Seki, Masaki Hata, Daisuke Kitamura, Hirofumi Gonda (Dept. of Surgery, Oota General Hospital, Tokyo, Japan)

^○Takuhiro Kohsaki¹, Atsushi Kigi¹, Keisuke Oe¹, Toshiji Saibara¹, Kouichi Sakamoto², Masaya Munekage², Kazuhiro Hanazaki², Takanori Sawai³, Naomi Mitsuda³, Hiroaki Hisakawa³, Mikiya Fujieda³, Fumimoto Yamasaki⁴, kouichi Yamashita⁴, Masataka Yokoyama⁴ (1.Dept. of Gastroenterology and Hepatology, Kochi Medical School, Kochi, Japan, 2.Dept. of Surgery, Kochi Medical School, Kochi, Japan, 3.Dept. of Pediatric, Kochi Medical School, Kochi, Japan, 4.Dept. of Anesthesiology, Kochi Medical School, Kochi, Japan)