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

^○Yoshiaki Murakami, Kenichiro Uemura, Naru Kondo, Naoya Nakagawa, Kenjiro Okada, Yuta Kuhara, Taijiro Sueda (Department of Surgery, Institute of Biomedical and Health Sciences, Hiroshima University)

^○Masayoshi Hioki, Chiaki Kobatake, Masashi Yoshimoto, Kazuteru Monden, Hiroshi Sadamori, Norihisa Takakura (Department of Surgery, Fukuyama City Hospital, Hiroshima, Japan)

^○Motokazu Sugimoto, Shin Kobayashi, Shinichiro Takahashi, Masaru Konishi, Naoto Gotohda (Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, Kashiwa, Japan)

^○Koichi Tomita, Naokazu Chiba, Shigeto Ochiai, Kei Yokozuka, Takahiro Gunji, Masaaki Okihara, Toru Sano, Rina Tsutsui, Shigeyuki Kawachi (Department of Digestive and Transplantation Surgery, Tokyo Medical University Hachioji Medical Center, Tokyo, Japan)

^○Yosuke Inoue, Akio Saiura, Yoshihiro Mise, Takeaki Ishizawa, Hiromichi Ito, Yu Takahashi (Dept. of Hepatobiliary-pancreatic Surgery, Cancer Institute Hospital, Tokyo, Japan)