1. Department of Epidemiology and Biostatistics, School of Public Health, Peking University
2. China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University
3. Institute for Global Health and Development, Peking University
4. Global Center for Infectious Disease and Policy Research & Global Health and Infectious Diseases Group, Peking University
5. Key Laboratory of Epidemiology of Major Diseases (Peking University), Ministry of Education, Beijing, China.