1. Division of Kidney and Pancreas Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
2. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, Seoul, South Korea
3. Division of Nephrology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
4. Department of Biomedical Informatics, Asan Medical Center, Seoul, South Korea