1. HIRA Research Institute, Health Insurance Review and Assessment Service, Wonju, Korea.
2. Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Family Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Public Healthcare Center, Seoul National University Hospital, Seoul, Korea.
5. Institue of Health Policy and Management, Seoul National University Medical Research Center, Seoul, Korea.
6. COMWEL Taebaek Hospital, Taebaek, Korea.