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

^○Hisashi Nakayama, Tadatoshi Takayama, Yutaka Midorikawa, Osamu Aramaki, Masaru Aoki (Department of Digestive Surgery, Nihon University School of Medicine, Tokyo, Japan)

^○Daisuke Hayashi, Seiji Natsume, Yoshiki Senda, Koji Komori, Yasuhiro Shimizu (Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, Nagoya, Japan)

^○Takuro Terada, Takeshi Mitui, Yosuke kato, Hiroaki Sugita (Department of Surgery, Fukui-Prefecture Saiseikai Hospital, Fukui, Japan)

^○Hideto Ochiai, Atsuko Fukazawa, Ryuta Muraki, Osamu Zindo, Keisuke Inaba, Shohachi Suzuki (Department of Gastroenterology, Iwata City Hospital)