1. Artificial Organ and Transplantation Surgery Division, Department of Surgery, Graduate School of Medicine; University of Tokyo; 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8655 Japan
2. Organ Transplantation Service; University of Tokyo; 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8655 Japan
3. Department of Surgery; Japanese Red Cross Medical Center; 4-1-22 Hiro-o Shibuya-ku, Tokyo 150-8935 Japan