^○Kenichi Matsuo^1,3, Daisuke Kawaguchi², Takafumi Kumamoto³, Yutaro Kikuchi³, Takashi Murakami³, Yukihiko Hiroshima³, Chihiro Kosugi⁴, Itaru Endo³, Keiji Koda⁴, Kuniya Tanaka² (1.Department of Surgery, Yokohama Rosai Hospital, Yokohama, Japan, 2.Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan, 3.Department of Gastroenterological Surgery, Graduate School of Medicine, Yokohama City University, Yokohama, Japan, 4.Department of Surgery, Teikyo University Chiba Medical Center, Chiba, Japan)

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

^○Hiroki Kato, Shin Kobayashi, sho Yasuda, Naoki Yagi, Masatake Taniguchi, Ryo Morisue, Toshiyuki Suzuki, Masashi Kudo, Hidetoshi Aizawa, Satoshi Okubo, Daigoro Takahashi, Motokazu Sugimoto, Shinichiro Takahashi, Naoto Gotoda, Masaru Konishi (Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, Chiba, Japan)

^○Tadao Ito (Department of Surgery, Rakuwakai Marutamachi Hospital)

^○Hiroyuki Kanazawa, Satoshi Nara, Kengo Fukuoka, Toshimitsu Iwasaki, Yoji Kishi, Minoru Esaki, Kazuaki Shimada (Department of Hepatobiliary pancreatic Surgery, National Cancer Center, Tokyo, Japan)

^○Junji Iwasaki, Takahisa Kyogoku, Atsushi Itami, Tetsuya Shiota, Masato Mtsuura, Mio Yoshimura, Yuwa Takahashi, Keiji Nagata (Department of Surgery, Kobe City Nishi-Kobe Medical Center)