Affiliation: | 1. Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China;2. Key Laboratory of Public Health Safety (Fudan University), Ministry of Education, Shanghai, China;3. Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Canada;4. Nebraska Center of Virology and the School of Biological Sciences, University of Nebraska‐Lincoln, Lincoln, Nebraska |