1. Department of Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
2. Seoul National University Biomedical Informatics (SNUBI), Division of Biomedical Informatics, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Information Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Transplantation Research Institute, Seoul National University College of Medicine, Seoul, Korea.