1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, The Armed Forces Capital Hospital, Seongnam, Korea.
3. Department of Nephrology, Ajou University School of Medicine, Suwon, Korea.
4. Transplantation Center, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Hallym University Kangdong Sacred Heart Hospital, Seoul, Korea.
6. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.