^○Mayumi Hoshikawa, Takazumi Tsunenari, Toru Kato, Makoto Nishikawa, Takahiro Einama, Takuji Noro, Hironori Tsujimoto, Kazuo Hase, Hideki Ueno, Junji Yamamoto (Department of Surgery, National Defense Medical College, Saitama, Japan)

^○Yoshiro Fujii, Takeomi Hamada, Koichi Yano, Naoya Imamura, Masahide Hiyoshi, Atsushi Nanashima (Department of Hepato-Biliary-Pancreatic Surgery, Miyazaki University, Miyazaki, Japan)

^○Tsuyoshi Notake, Akira Kobayashi, Takahide Yokoyama, Akira Shimizu, Hiroaki Motoyama, Kenta Yokoi, Kentarou Fukushima, Hitoshi Masuo, Hiroki Sakai, Kiyotaka Hosoda, Shinichi Miyagawa (Department of Surgery, Shinshu University, Matsumoto, Japan)

^○Yoshihiro Edamoto^1,2, Toshiaki Kurokawa¹, Fuminori Mihara¹, Fuyuki Inagaki¹, Nobuyuki Takemura¹, Norihiro Kokudo¹ (1.Department of Surgery, National Center for Global Health and Medicine, Tokyo, Japan, 2.Department of Surgery, Higashisaitama National Hospital)

^○Michiki Narushima (Department of Surgery, Shimizu Kousei Hospital)

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