1. Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Prevention and Control, Beijing, China
2. Beijing Research Center for Preventive Medicine, Beijing, China
3. Centre for Infectious Diseases, Epidemiology and Surveillance, National Institute for Public Health and the Environment, Bilthoven, The Netherlands
4. Department of Health, Ethics & Society, CAPHRI Care and Public Health Research Institute, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands
5. Department of Environmental and Occupational Health, School of Public Health, University of Nevada Las Vegas, Las Vegas, NV, USA
6. School of Public Health, Capital Medical University, Beijing, China