^○Yasuyuki Fukami, Atsuyuki Maeda, Yuichi Takayama, Takamasa Takahashi, Masahito Uji, Yuji Kaneoka (Department of Surgery, Ogaki Municipal Hospital, Gifu, Japan)

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

^○Atsushi Oba, Yu Takahashi, Yosuke Inoue, Yuichi Nakaseko, Shoichi Irie, Takeaki Ishizawa, Yoshihiro Mise, Hiromichi Ito, Yoshihiro Ono, Hirofumi Sato, Akio Saiura (Department of Hepatobiliary Pancreatic Surgery, Cancer Institute Hospital of JFCR, Tokyo, Japan)

^○Junya Toyoda, Ryusei Matsuyama, Yasuhiro Yabushita, Yu Sawada, Takashi Murakami, Nobuhiro Tsuchiya, Takafumi Kumamoto, Itaru Endo (Departments of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan)