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

^○Shinjiro Tomiyasu¹, Yukihiro Inomata¹, Hideo Baba² (1.Department of Surgery, Kumamoto Rosai Hospital, Kumamoto, Japan, 2.Kumamoto, Japan)

^○Kodai Abe, Keiichi Suzuki, Yuuki Mae, Masashi Yahagi, Takeshi Murata, Hiroyuki Sako, Masayoshi Osaku, Yoshiyuki Ishii (Department of Surgery, Kitasato University Kitasato Institute Hospital, Tokyo, Japan)

^○Chikato Koga, Junzo Shimizu, Tae Matsumura, Masahiro Murakami, Junichi Hasegawa (Department of Surgery, Osaka Rosai Hospital)

^○Kimihiko Ueno, Tetsuo Ajiki, Yuu Hashimoto, Masayuki Akita, Daisuke Tsugawa, Masahide Awazu, Hideyo Mukubou, Shouhei Komatsu, Hisoka Kinoshita, Yoshio Terai, Motofumi Tanaka, Hirotika Toyama, Masahiro Kido, Takumi Fukumoto (Department of Hepatobiliary-pancertic Surgery, Kobe University, Kobe Japan)

^○Toshiro Masuda, Kenichi Ogata, Taishi Yamane, Hideaki Takeyama, Katsuhiro Ogawa, Hiromitsu Hayashi, Shinichi Akahoshi, Katsutaka Matsumoto, Yoshiaki Ikuta, Hiroshi Takamori (Department of Surgery, Saiseikai Kumamoto Hospital, Kumamoto, Japan)

^○Takanori Morikawa, Masaharu Ishida, Tatsuyuki Takadate, Tatsuo Hata, Masahiro Iseki, Kyouhei Ariake, Kunihiro Masuda, Takeshi Aoki, Koji Fukase, Masamichi Mizuma, Hideo Ohtsuka, Kei Nakagawa, Hiroki Hayashi, Shigehito Miyagi, Fuyuiko Motoi, Takashi Kamei, Takeshi Naitoh, Michiaki Unno (Department of Surgery, Tohoku University Graduate School of Medicine)