Fudan University - School of Public Health, Fudan University - School of Public Health, University of Michigan at Ann Arbor - Department of Health Management and Policy, University of Michigan at Ann Arbor - Department of Epidemiology, Fudan University - School of Public Health, Fudan University - School of Public Health, Chinese Center for Disease Control and Prevention (China CDC) - National Immunization Program, Duke University - Duke Global Health Institute, Fudan University - Key Laboratory of Public Health Safety (Ministry of Education), Fudan University - School of Public Health, Fudan University - School of Public Health, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Fudan University - School of Public Health and Fudan University - Shanghai Institute of Infectious Disease and Biosecurity