1. Organ Transplant Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Transplant Center, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Healthcare Management, Soonchunhyang University College of Medical Science, Asan, Korea.
4. Department of Surgery and the Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Korea.