1. Department of Internal Medicine, Eulji University of Medicine, Daejeon, Korea.
2. Transplantation Center, Seoul National University Hospital, Seoul, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Surgery, Keimyung University School of Medicine, Daegu, Korea.
6. Transplantation Research Institute, Seoul National University, Seoul, Korea.