1. Graduate School of Public Health and Institute of Health and Environment, Seoul National University, Seoul, Korea.
2. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea.
4. Department of Public Health and Community Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
5. Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
6. Division of Infectious Diseases, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.