1. Department of Family Medicine, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, Korea.
2. Department of Medicine, Graduate School of Medicine, Yonsei University, Seoul, Korea.
3. Department of Family Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Family Medicine, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
6. Public Healthcare Center, Seoul National University Hospital, Seoul, Korea.
7. Institute of Health Policy and Management, Seoul National University Medical Research Center, Seoul, Korea.