^○Tsukasa Takayashiki, Hideyuki Yoshitomi, Katsunori Furukawa, Satoshi Kuboki, Shigetsugu Takano, Daisuke Suzuki, Nozomu Sakai, Shingo Kagawa, Hiroyuki Nojima, Takashi Mishima, Masayuki Ohtsuka (Department of General Surgery, Graduate School of Medicine, Chiba University)

^○Yuta Abe¹, Masayuki Tanaka¹, Kohei Mishima¹, Hiroshi Yagi¹, Minoru Kitago¹, Masahiro Shinoda¹, Osamu Itano², Yuko Kitagawa¹ (1.Department of Surgery, Keio University School of Medicine, 2.Hepato-Biliary-Pancreatic & Gastrointestinal Surgery, International University of Health and Welfare School of Medicine)