^○Shingo Shimada, Toshiya Kamiyama, Hideki Yokoo, Tatsuya Orimo, Kenji Wakayama, Akihisa Nagatsu, Hirofumi Kamachi, Akinobu Taketomi (Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Japan)

^○Kengo Fukuoka, Satoshi Nara, Toshimitsu Iwasaki, Yoji Kishi, Minoru Esaki, Kazuaki Shimada (Hepatobiliary and Pancreatic Surgery Division, National Cancer Center Hospital, Tokyo, Japan)

^○Takahiro Yoshikawa, Takeo Nomi, Daisuke Hokuto, Yasuko Matsuo, Masayuki Sho (Department of Surgery, Nara Medical University, Nara, Japan)

^○Takatsugu Matsumoto, Taku Aoki, Keigo Tani, Kyung Hwa Park, Takayuki Shiraki, Shozo Mori, Yukihiro Iso, Masato Kato, Takayuki Shimizu, Keiichi Kubota (Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan)

^○Genya Hamano¹, Akishige Kanazawa¹, Shintaro Kodai¹, Sadatoshi Shimizu¹, Akihiro Murata¹, Yorihisa Urata¹, Kohei Nishio¹, Masahiko Kinoshita¹, Yukio Nishiguchi² (1.Department of Hepato-Biliary-Pancreatic Surgery, Osaka City General Hospital, 2.Department of Gastroenterological Surgery, Osaka City General Hospital, Osaka, Japan)

^○Ryo Morisue, Shinichiro Takahashi, Masatake Taniguchi, Naoki Yagi, Sho Yasuta, Toshiyuki Suzuki, Hidetoshi Aizawa, Masashi Kudo, Satoshi Okubo, Daigoro Takahashi, Motokazu Sugimoto, Shin Kobayashi, Masaru Konishi, Naoto Gotohda (Division of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, Kashiwa, Japan)