1. Department of Laboratory Science and Technology & Vaccine Research Center, School of Public Health, Peking University, Beijing, China
2. Department of HIV & AIDS, Populations Services International, Lilongwe, Malawi
3. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China
4. Department of Health Policy and Management, School of Public Health, Peking University, Beijing, China
5. Global Center for Infectious Disease and Policy Research & Global Health and Infectious Diseases Group, Peking University, Beijing, China
6. Ministry of Education, Key Laboratory of Epidemiology of Major Diseases (Peking University), Beijing, China