^○Takuya Ando, Jun Sakata, Takashi Kobayashi, Kazuyasu Takizawa, Kohei Miura, Tomohiro Katada, Hirosuke Ishikawa, Yuki Hirose, Tetsuya Nakano, Koji Toge, Kizuki Yuza, Daiki Soma, Toshifumi Wakai (Division of Digestive and General Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan)

^○Sadaaki Yamazoe, Ryosuke Amano, Kenjiro Kimura, Go Ohira, Jun Tauchi, Ryota Tanaka, Masaichi Ohira (Department of Surgical Oncology (First Department of Surgery) Osaka City University Graduate School of Medicine)

^○Fumiya Sato, Shinya Watanabe, Keiji Aizu, Atsuki Arimoto, Yumiko Kageyama, Yasuhiro Mitake, Ryuzo Yamaguchi (Department of Surgery, Kasugai Municipal Hospital, Aichi, Japan)

^○Yusuke Izumisawa, Kotaro Nagamine, Yuzo Minegishi, Junki Yamada, Hiroaki Sugiura, Kunio Kameda, Yoshinori Takekawa, Akira Kubo (Department of Surgery, Yokosuka Municipal Hospital, Kanagawa, Japan)

^○Masaaki Yokoyama, Nobuhiro Hasui, Sangchul Kim, Hirokazu Momose, Ryota Matsuki, Masaharu Kogure, Tetsuya Nakazato, Yutaka Suzuki, Masanori Sugiyama (Department of Surgery, Kyorin University, Tokyo, Japan)

^○Syuhei Kushiyama, Akihiro Murata, Sadatoshi Shimizu, Shintaro Kodai, Kohei Nishio, Yorihisa Urata, Kotaro Miura, Masahiko Kinoshita, Genya Hamano, Tetsuzo Tashima, Sota Deguchi, Akishige Kanazawa (Department of Hepato-Biliary-Pancreatic Surgery, Osaka City General Hospital, Osaka, Japan)