1. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
2. Inner Mongolia Center for Disease Control and Prevention, Hohhot, China
3. Department of Statistics, School of Public Health, Tianjin Medical University, Tianjin, China
4. Discipline of Public Health, University of Adelaide, Adelaide, Australia
5. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
6. Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
7. School of Public Health, Queensland University of Technology, Queensland, Australia