1. Department of Epidemiology, Seoul National University Graduate School of Public Health, Seoul, Korea.
2. Institute of Infectious Disease, Seoul National University College of Medicine, Seoul, Korea.
3. Division of Pediatric Infectious Diseases, The Warren Alpert Medical School of Brown University, Providence, RI, USA.
4. Division of Infectious Disease Surveillance, Center for Control of Infectious Diseases, KCDC, Osong, Korea.
5. Division of Infectious Diseases, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
6. Department of Family Medicine, Seoul National University College of Medicine, Seoul, Korea.