1. Department of Hepato-Biliary-Pancreatic Surgery, Saitama Medical Center; Saitama Medical University; 1981 Tsujido-cho, Kamoda Kawagoe Saitama 350-8550 Japan
2. Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine; University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8655 Japan