^○Shigeru Kato, Koji Doi, Yuki Hirose (Department of Surgery, Japanese Red Cross Fukui Hospital, Fukui, Japan)

^○Masaaki Kataoka, Takashi Kaiho, Shinji Yanagisawa, Masaki Nishimura, Souichi Kobayashi, Akira Okaniwa, Ryuichirou Suda, Eri Nakadai, Yoshihito Oka, Taku Machida, Hideyuki Yamada, Toshikazu Tsuchiya (Department of Surgery, Kimitsu Chuo Hospital, Chiba, Japan)

^○Kazuhisa Takeda, shiori inoue, seiya sato, yuji Yanmamoto, Risa SAKAMOTO, keiishi yazawa, Tetuya SHIMIZU, Goro Matuda, Hitoshi Sekido (Department of Surgery, Yokohama Medical Center, Yokohama, Japan)

^○Akiko Nakazawa, Ryota Kogure, Tetsuya Mitsui, Yoichi Miyata, Riki Ninomiya, Masahiko Komagome, Akira Maki, Yoshifumi Beck (Saitama medical center, Saitama Medical University, Hepato-Biliary-Pancreatic Surgery)

^○Yu Matsumoto, Masaru Tsuchiya, Syo Yoshino, Yuko Ito, Kazutaka Kimura, Yoshihisa Kubota, Tetsuya Maeda, Toshio Katagiri, Yuichiro Otsuka, Hironori Kaneko (Department of Surgery, Toho university omori medical center, Tokyo, Japan)