Peking University - Beijing International Center for Mathematical Research, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Population Medicine and Public Health, Peking University - Academy for Advanced Interdisciplinary Studies, University of Southampton - WorldPop, Chinese Center for Disease Control and Prevention (China CDC) - Division of Infectious Disease, Chinese Center for Disease Control and Prevention (China CDC) - Division of Infectious Disease, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Population Medicine and Public Health, Peking University - Center for Statistical Sciences and Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Population Medicine and Public Health