^○Yoshifumi Iwagami, Hidetoshi Eguchi, Daisaku Yamada, Tadafumi Asaoka, Takehiro Noda, Koichi Kawamoto, Kunihito Gotoh, Shogo Kobayashi, Masaki Mori, Yuichiro Doki (Department of Gastroenterological Surgery, Osaka University, Osaka, Japan)

^○Masafumi Imamura, Yasutoshi Kimura, Hiroshi Yamaguchi, Minoru Nagayama, Yoko Kuga, Akina Kimura, Takuro Kyuno, Toru Mizuguchi, Ichiro Takemasa (Department of Surgery, Surgical Oncology and Science, Sapporo Medical University)

^○Keinosuke Ishido, Daisuke Kudo, Norihisa Kimura, Taiichi Wakiya, Kenichi Hakamada (Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine)

^○Yoshiaki Ikuta, Taishi Yamane, Hideaki Takeyama, Hiromitsu Hayashi, Shinichi Akahoshi, Toshiro Masuda, Hiroshi Takamori (Department of Surgery, Saiseikai Kumamoto Hospital, Kumamoto, Japan)

^○Junichi Arita, Yoshihiro Sakamoto, Nobuhisa Akamatsu, Junichi Kaneko, Kiyoshi Hasegawa (Hepato-Biliary and Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine, University of Tokyo)

^○Takashi Murakami, Ryusei Matsuyama, Ryutaro Mori, Yasuhiro Yabushita, Yu Sawada, Nobuhiro Tsuchiya, Masanori Oshi, Kouki Goto, Takafumi Kumamoto, Itaru Endo (Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine)