^○Naoto Gotohda, Motokazu Sugimoto, Shin Kobayashi, Shinichiro Takahashi, Masaru Konishi (Division of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, Kashiwa, Japan)

^○Takahiro Akahori, Minako Nagai, Satoshi Nishiwada, Kenij Nakagawa, Kota Nakamura, Takeo Nomi, Daisuke Hokuto, Takahiro Yoshikawa, Yasuko Matsuo, Naoya Ikeda, Masayuki Sho (Department of Surgery, Nara Medical university, Nara, Japan)

^○Hiroyuki Sugo, Yuki Sekine, Ryusuke Ichikawa, Shozo Miyano, Ikuo Watanobe, Michio Machida, Kuniaki Kojima (Department of General Surgery, Juntendo University Nerima Hospital)

^○Hisahi Ikoma¹, Ryou Morimura¹, Taisuke Imamura¹, Tomohiro Arita¹, Toshiyuki Kosuga¹, Yasutoshi Murayama¹, Atsushi Shiozaki¹, Yoshiaki Kuriu¹, Toshiya Ochiai², Eigo Otsuji¹ (1.Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, 2.Department of Surgery, North Medical Center, Kyoto Prefectural University of Medicine)

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

^○Kota Sato, Kenichi Matsuo, Takeshi Murakami, Yuko Ikeda, Naohiro Aida, Hiroshi Suitou, Toshiharu Hanaoka, Atsushi Hirano, Yasushi Okazaki, Kouichi Shinotou (Yokohama Rosai Hospital, Kanagawa, Japan)