^○Hiroshi Sadamori, Masayoshi Hioki, Kazuteru Monden, Masashi Yoshimoto, Chiaki Kobatake, Norihisa Takakura (Department of Surgery, Fukuyama City Hospital, Fukuyama, Japan)

^○Satoru Imura, Hiroki Teraoku, Yu Saito, Shuichi Iwahashi, Tetsuya Ikemoto, Yuji Morine, Mitsuo Shimada (Department of Surgery, Tokushima University)

^○Atsushi Kudo, Keiichi Akahoshi, Toshio Ogura, Hiroaki Ono, Yusuke Mitsunori, Daisuke Ban, Kosuke Ogawa, Minoru Tanabe (Department of Hepato-Biliary-Pancreatic Surgery, Tokyo JAPAN)

^○Hisashi Kosaka¹, Sohei Satoi¹, Hiroaki Yanagimoto¹, Yumiko Kono², Tomohisa Yamamoto¹, Satoshi Hirooka¹, So Yamaki¹, Masaya Kotsuka¹, Taku Michiura¹, Kentaro Inoue¹, Yoichi Matsui¹ (1.Kansai Medical University, Department of Surgery, 2.Kansai Medical University, Department of Radiology)

^○Kosuke Yamada¹, Masahiko Murakami¹, Takeshi Aoki², Kodai Tomioka¹, Tomoki Hakozaki¹, Hideki Shibata¹, Yoshihiko Tashiro¹, Tomokazu Kusano¹, Tomotake Koizumi¹, Satoru Goto¹, Akira Fujimori², Yuta Enami³, Koji Otsuka¹ (1.Department of Surgery, Division of General and Gastroenterological Surgery, Showa University School of Medicine, TOKYO, Japan, 2.Showa University Fujigaoka Hospital, 3.Showa University Northern Yokohama Hospital)