^○Shinichiro Takahashi, Motokazu Sugimoto, Shin Kobayashi, Satoshi Ookubo, Masaru Konishi, Naoto Gotohda (Dept. of Hepato-Biliary Pancreatic Surgery, National Cancer Center Hospital East)

^○Takafumi Sato, Yuichi Nakaseko, Shoji Kawakatsu, Genki Watanabe, Atsushi Oba, Shoichi Irie, Yoshihiro Ono, Tomoya Mizuno, Yoshihiro Mise, Takeaki Ishizawa, Yosuke Inoue, Hiromichi Ito, Yu Takahashi, Akio Saiura (Department of Gastroenterological Surgery, Cancer Institute Hospital of Japanese foundation for cancer research)

^○Yoichi Matsuo, Goro Ueda, Yuichi Hayashi, Hiroyuki Imafuji, Kenta Saito, Tomoya Shamoto, Ken Tsuboi, Mamoru Morimoto, Hiroki Takahashi, Hideyuki Ishuguro, Shuji Takiguchi (Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan)

^○Koji Shibata, Takashi Hiromatsu, Daisuke Takara, Keigo Hara, Koichi Nakahashi, Noriaki Ohara, Yuichi Machiki (Department of Surgery, Kiryu Kosei General Hospital)

^○Naoto Hadano, Takeshi Sudo, Kouhei Ishiyama, Takashi Onoe, Hirotaka Tashiro (Department of Surgery, National Hospital Organization KURE medical center)

^○Susumu Suzuki, Takashi Aono, Tomohiro Maruyama (Department of Surgery, Niigata Prefectural Central Hospital)