1. Division of Hepato-Biliary-Pancreas Surgery, Department of Surgery, University of Miyazaki, Faculty of Medicine, Kiyotake, Miyazaki, Japan
2. Department of Surgery Oncology, Nagasaki University, School of Biomedical Sciences, Nagasaki, Japan
3. Department of Surgical Oncology, Nagasaki University, School of Biomedical Sciences, Nagasaki, Japan