^○Yusuke Ome, Goro Honda, Jun Yamamoto, Manami Doi, Yuki Homma (Department of Hepato-Biliary-Pancreatic Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan)

^○Yoshiteru Katsura, Yutaka Takefda, Yoshiaki Ohmura, Takuya Sakamoto, Kenji Kawai, Kohei Murakami, Atsushi Naito, Yoshinori Kagawa, Toru Masuzawa, Atsushi Takeno, Takeshi Kato, Shigeyuki Tamura, Kohei Murata (Department of Surgery, Kansai Rosai Hospital, Hyogo, Japan)

^○Hiroshi Tajima, Yusuke Kumamoto, Shigenori Ei, Nobuyuki Nishizawa, Takashi Kaizu, Masahiko Watanabe (Department of Surgery, Kitasato University Hospital)

^○Gozo Kiguchi, Masayuki Kojima, Tadashi Kagawa, Akira Yasuda, Sanae Nakajima, Yoshinao Tanahashi, Yutaro Kato, Ichiro Uyama, Atsushi Sugioka (Department of Surgery, Fujita health University, Toyoake, Japan)

^○Mizuki Ninomiya^1,2, Takashi Matsui¹, Takahiro Tomino¹, Rumi Matono¹, Hideaki Uchiyama², Takashi Nishizaki¹ (1.Department of Surgery, Matsuyama Red Cross Hospital, Matsuyama, Japan, 2.Saiseikai Fukuoka General Hospital)

^○Saiho Ko, Ayumi Nishioka, Yukimi Tanaka, Shintaro Miyao, Mitsuhiro Nakatani, Masanori Matsusaka, Tomohide Mukogawa, Hirofumi Ishikawa, Akihiko Watanabe (Department of Surgery, Nara Prefecture General Medical Center)