^○Naruo Tokuyasu, Soichiro Honjo, Masataka Amisaki, Masaki Morimoto, Ei Uchinaka, Joji Watanabe, Teruhisa Sakamoto, Keigo Ashida, Hiroaki Saito, Yoshiyuki Fujiwara (Department of Surgery,Tottori University, Yonago, Japan)

^○Toshiyuki Natsume, Osamu Kainuma, Takashi Maruyama, Akinari Miyazaki, Nanami Kato (Department of Surgery, Funabashi Municipal Medical Center, Chiba, Japan)

^○Hidetake Amemiya, Mistuaki Watanabe, Naohiro Hosomura, Hiromitu Kawaida, Hiroshi Kono, Daisuke Ichikawa (First Department of Surgery, University of Yamanashi)

^○Hiroji Shinkawa, Shogo Tanaka, Shigekazu Takemura, Tokuji Ito, Takanori Aota, Masaki Koda, Toru Miyazaki, Shoji Kubo (Department of Hepato-Biliary-Pancreatic Surgery, Osaka City University Graduate School of Medicine)

^○Yoshinori Takeda^1,2, Akio Saiura¹, Yoshihiro Mise¹, Takeaki Ishizawa¹, Yosuke Inoue¹, Yu Takahashi¹, Ryuji Yoshioka³, Hiromichi Ito¹ (1.Department of Hepatobiliary-Pancreatic Sugery, Cancer Institute Hospital, Japanese Foudation for Cancer Research, Tokyo, Japan, 2.Department of Hepatobiliary-Pancreatic Surgery, Juntendo University School of Medicine, Tokyo, Japan, 3.Department of Surgery, Dokkyo Medical University Koshigaya Hospital, Saitama, Japan)

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