1. Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, Athens, Georgia, USA
2. Center for Global Health, College of Public Health, University of Georgia, Athens, Georgia, USA
3. Stanford University, School of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford, California, USA
4. Biostatistics & Research Design Unit School of Medicine, University of Missouri-Columbia, Columbia, Missouri, USA
5. Department of Chronic Communicable Disease, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, Jiangsu Province, People’s Republic of China
6. Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Shanghai, China
7. School of Public Health, Fudan University, Shanghai, China