Peking University - Department of Epidemiology and Biostatistics, Peking University - Department of Epidemiology and Biostatistics, Peking University - Department of Epidemiology and Biostatistics, Chinese Center for Disease Control and Prevention (China CDC), Peking University - Department of Epidemiology and Biostatistics, Peking University, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Population Medicine and Public Health, Beijing Research Center for Preventive Medicine - Beijing Center for Disease Prevention and Control, affiliation not provided to SSRN, Chinese Academy of Sciences (CAS) - State Key Laboratory of Management and Control for Complex Systems, Beijing Research Center for Preventive Medicine - Beijing Center for Disease Prevention and Control, affiliation not provided to SSRN, Tohoku University, Peking University - Center for Reproductive Medicine, University of New South Wales (UNSW) - The George Institute for Global Health, affiliation not provided to SSRN, affiliation not provided to SSRN, Hubei Provincial Center for Disease Control and Prevention, affiliation not provided to SSRN, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Zhejiang Provincial Center for Disease Control and Prevention - Immunization Program Department and affiliation not provided to SSRN