^○Akira Watanabe^1,2, Kenichirou Araki^1,2, Norihumi Harimoto^1,2,3, Tomoharu Yoshizumi³, Kouta Arima⁴, Youichi Yamashita⁴, Hideo Baba⁴, Tetsuya Higuchi⁵, Hiroyuki Kuwano², Ken Shirabe^1,2 (1.Department of Hepatobiliary and Pancreatic Surgery, Gunma University, 2.Department of General Surgical Science, Gunma University, 3.Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, 4.Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, 5.Department of Diagnostic Radiology and Nuclear Medicine, Gunma University)

^○Daisuke Kudo, Keinosuke Ishido, Norihisa Kimura, Kenichi Hakamada (Department of Gastroenterological Surgery, Hirosaki University, Hirosaki, Japan)

^○Junichi Shindoh, Yuta Kobayashi, Yoshitaka Kiya, Toshitaka Sugawara, Masaji Hashimoto (Department of Gastroenterological Surgery, Toranomon Hospital)

^○Hiroyuki Yoshidome^1,2, Kazuyasu Shinmura², Hidehito Shibasaki², Shintaro Maeda², Hitoe Nishino², Hideyuki Yoshitomi³, Masayuki Ohtsuka³ (1.Department of Surgery, Oami Municipal Hospital, 2.Department of Surgery, Saitama Red Cross Hospital, 3.Department of General Surgery, Chiba University)

^○Yoshihiro Mise, Takeaki Ishizawa, Yosuke Inoue, Hiromichi Ito, Yu Takahashi, Akio Saiura (Cancer Institute Hospital)