1. Department of Epidemiology and Biostatistics, School of Public Health, Nanjing Medical University, Nanjing 211166, China
2. Department of Infectious Diseases, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
3. Department of Basic and Community Nursing, School of Nursing, Nanjing Medical University, Nanjing 211166, China
4. Department of Infectious Diseases, The Jurong People’s Hospital, Jurong 212400, China
5. Department of Epidemiology, Medical Institute of Nanjing Army, Nanjing 210002, China