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

^○Rei Toda, Satoru Seo, Hiroto Nishino, Masayuki Okuno, Ken Fukumitu, Takamichi Ishii, Kojiro Taura, Hideaki Okajima, Toshimi Kaido, Shinji Uemoto (Department of Surgery, Kyoto University, Kyoto, Japan)

^○Takehiro Noda¹, Hidetoshi Eguchi¹, Yoshifumi Iwagami¹, Daisaku Yamada¹, Tadafumi Asaoka¹, Koichi Kawamoto¹, Kunihito Gotoh¹, Shogo Kobayashi¹, Koji Umeshita², Yuichiro Doki¹, Masaki Mori¹ (1.Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan, 2.Division of Health Sciences, Graduate School of Medicine, Osaka University, Osaka, Japan)

^○Takaharu Kato, Hiroshi noda, Naoya Kasahara, Fumiaki Watanabe, Yuhei Endo, Toshiki Rikiyama (Department of Surgery, Saitama Medical Center, Jichi Medical University)