^○Tomohiro Katada, Jun Sakata, Takuya Ando, Daiki Soma, Kizuki Yuza, Koji Toge, Yuki Hirose, Tetsuya Nakano, Hirosuke Ishikawa, Kohei Miura, Kazuyasu Takizawa, Takashi Kobayashi, Toshifumi Wakai (Digestive and General Surgery, Niigata University, Niigata, Japan)

^○Kizuki Yuza, Jun Sakata, Takuya Ando, Daiki Soma, Koji Toge, Yuki Hirose, Tetsuya Nakano, Hirosuke Ishikawa, Tomohiro Katada, Kohei Miura, Kazuyasu Takizawa, Takashi Kobayashi, Toshifumi Wakai (Division of Digestive and General Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata City, Japan)

^○Taro Mashiko, Naoki Yazawa, Daisuke Furukawa, Misuzu Yamada, Yoshihito Masuoka, Toshio Nakagohri (Depertment of Gastrointestinal Surgery, Tokai University, Kanagawa, Japan)

^○Toshihiro Sakanaka, Shinya Hayami, Masaki Ueno, Manabu Kawai, Seiko Hirono, Ken-ichi Okada, Motoki Miyazawa, Yuji Kitahata, Norihiko Suzaki, Ryohei Kobayashi, Hiroki Yamaue (Second Department of Surgery, Wakayama Medical University, Wakayama, Japan)

^○Shunichi Shiozawa, Takebumi Usui, Kotaro Kuhara, Teppei Kono, Yukio Shimojima, Akira Tsuchiya, Tatsuomi Miyauchi, Kentaro Yamaguchi, Hajime Yokomizo, Takeshi Shimakawa, Kazuhiko Yoshimatsu, Takao Katsube, Yoshihiko Naritaka (Department of Surgery, Tokyo Women's Medical University Medical Center East, Tokyo, Japan)

^○Naoya Imamura, Atsushi Nanashima, Takeomi Hamada, Koichi Yano, Masahide Hiyoshi, Yoshiro Fujii (Department of Surgery, Miyazaki University Faculty of Medicine, Miyazaki, Japan)