1. Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease, People’s Republic of China;
2. Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, People’s Republic of China;
3. Beijing Pinggu District Center for Disease Prevention and Control, Beijing, People’s Republic of China;
4. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China;
5. Beijing Municipal Key Laboratory of Clinical Epidemiology, Beijing 100069, China