1. Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China
2. Department of Laboratorial of Science and Technology & Vaccine Research Center, School of Public Health, Peking University, Beijing, People’s Republic of China
3. Center for Infectious Disease and Policy Research & Global Health and Infectious Diseases Group, Peking University, Beijing, People’s Republic of China
4. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, People’s Republic of China
5. Ministry of Education, Key Laboratory of Epidemiology of Major Diseases (Peking University), Beijing, People’s Republic of China