1. Department of Biostatistics, School of Public Health, and The Key Laboratory of Public Health Safety of Ministry of Education, Fudan University, Shanghai, People's Republic of China
2. Shanghai Institute of Infectious Disease and Biosecurity, Shanghai, People's Republic of China
3. Department of Epidemiology and Biostatistics, University of South Carolina, Columbia, SC, USA
4. Department of Exercise Science, University of South Carolina, Columbia, SC, USA