1. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Surgery, Keimyung University School of Medicine, Daegu, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Transplant Research Institute, Seoul National University Medical Research Center, Seoul, Korea.
5. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.