1. Seoul Center for Infectious Disease Control and Prevention, Seoul, Korea.
2. Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
3. Disease Control & Prevention Division, Seoul Metropolitan Government, Seoul, Korea.
4. Graduate School of Public Health, Seoul National University, Seoul, Korea.
5. Department of Urban Public Health, University of Seoul, Seoul, Korea.
6. HIRA Research Institute, Health Insurance Review & Assessment Service, Wonju, Korea.
7. Public Healthcare Center, Seoul National University Hospital, Seoul, Korea.
8. Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.