^○Yukio Iwashita, Hiroki Uchida, Teijiro Hirashita, Yuichi Endo, Kazuhiro Tada, Kunihiro Saga, Masayuki Ohta, Masafumi Inomata (Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine)

^○Keisuke Ida, Shinjiro Kobayashi, Sota Usui, Kohei Segami, Hiroyuki Hoshino, Masafumi Katayama, Satoshi Koizumi, Takehito Otusbo (Division of Gastroenterological and General Surgery St. Marianna University School of Medicine)

^○Masahiro Minagawa, Daisuke Motegi, Youhei Miura, Kaoru Abe, Tetsuya Naito, Tatsuo Tani, Naohiro Shimakage (Department of Surgery, Nagaoka Red Cross Hosipital, Niigata, Japan)

^○Yukihiro Iso, Takayuki Shiraki, Kyung Hwa Park, Keigo Tani, Takashi Suzuki, Takayuki Shimizu, Takatsugu Matsumoto, Shozo Mori, Masato Kato, Taku Aoki, Keiichi Kubota (Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan)

^○Kunihiro Masuda, Hiroki Hayashi, Tatsuo Hata, Masahiro Iseki, Tatsuyuki Takadate, Kyohei Ariake, Takeshi Aoki, Masaharu Ishida, Koji Fukase, Masamichi Mizuma, Hideo Ohtsuka, Kei Nakagawa, Takanori Morikawa, Fuyuhiko Motoi, Takeshi Naitoh, Michiaki Unno (Department of Surgery, Tohoku University, Sendai, Japan)

^○Mitsuru Kinoshita, Shogo Kobayashi, Hidetoshi Eguchi, Yoshifumi Iwagami, Daisaku Yamada, Tadafumi Asaoka, Takehiro Noda, Koichi Kawamoto, Kunihito Gotoh, Masaki Mori, Yuichiro Doki (Department of Gastroenterological Surgery, Osaka University, Osaka, Japan)