1 Division of Infectious disease, Key Laboratory of Surveillance and Early Warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China.
2 WorldPop, School of Geography and Environmental Science, University of Southampton, Southampton, UK.
3 Chinese Center for Disease Control and Prevention, Beijing, China.
4 CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
5 Chinese Center for Disease Control and Prevention, Beijing, China. fengzj@chinacdc.cn.