1. Department of Laboratory Science and Technology & Vaccine Research Center School of Public Health, Peking University Beijing China
2. Training Division Infection Control African Network (ICAN) Cape Town South Africa
3. Department of Health Policy and Management, School of Public Health Peking University Beijing China
4. Department of Epidemiology and Biostatistics, School of Public Health Peking University Beijing China
5. Department of Obstetrics and Gynaecology, School of Medicine Muhimbili University of Allied Sciences (MUHAS) Dar es Salaam Tanzania
6. Global Center for Infectious Disease and Policy Research & Global Health and Infectious Diseases Group Peking University Beijing China
7. Key Laboratory of Epidemiology of Major Diseases (Peking University), Ministry of Education Beijing China