^○Hironobu Suto, Keiichi Okano, Minoru Oshima, Yasuhisa Ando, Eisuke Asano, Hisashi Usuki, Yasuyuki Suzuki (Departments of Gastroenterological Surgery, Kagawa University, Kagawa, Japan)

^○Shunsuke Tabe^1,2, Hisashi Kametaka¹, Hironobu Makino¹, Tadaomi Fukada¹, Takahiro Akiyama¹, Manabu Saito¹, Miyako Oya¹, Kazuhiro Seike¹, Takashi Koyama¹, Masayuki Ohtuka^1,2 (1.Department of Surgery, Odawara Municipal Hospital, Kanagawa, Japan, 2.Department of General Surgery,Chiba University,Chiba,Japan)

^○Yoichi Miyata¹, Ryouta Kogure¹, Akiko Nakazawa¹, Tetsuya Mitsui¹, Riki Ninomiya¹, Masahiko Komogome¹, Akira Maki¹, Nobuaki Kawarabayashi², Yoshifumi Beck¹ (1.Department of Hepatobiliary pancreatic Surgery, Saitama medical center, Saitama medical university, 2.Department of Surgery, Gyoda general Hospital)

^○Kenta Inomata, Tomohiko Nakagawa, Yusuke Nie, Masashi Takahashi, Koji Hayashi, Junichi Shintoku (Department of Surgery, Ota Memorial Hospital)

^○Teppei Miyakawa, Hirofumi Shirakawa, Hiroki Nakanishi, Sojun Hoshimoto, Moriaki Tomikawa, Iwao Ozawa, Shoichi Hishinuma, Yoshiro Ogata (Department of Hepato-Biliary-Pancreatic Surgery, Tochigi Cancer Center, Tochigi, Japan)

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