1. Department of Preventive Medicine & Public Health, Yonsei University College of Medicine, Yonsei University, Korea.
2. Institute for Health Services Research, Yonsei University, Korea.
3. Department of Preventive Medicine, Yonsei University Wonju College of Medicine, Korea.
4. Clinical Outcomes Research Center, University of Minnesota School of Public Health, USA.
5. Department of Diagnostic Radiology, Yonsei University Wonju College of Medicine, Korea.
6. Department of Surgery, Yonsei University College of Medicine, Yonsei University, Korea.
7. Transplant Information Services, University of Minnesota, USA.