Yoshihiro Miyasaka1, Masafumi Nakamura1, Go Wakabayashi2. 1. Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. 2. Center for Advanced Treatment of Hepatobiliary and Pancreatic Diseases, Ageo Central General Hospital, Ageo, Saitama, Japan.