1. Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University , Nanjing 211166 , China
2. Department of Infectious Diseases, The First Affiliated Hospital of Nanjing Medical University , Nanjing , China
3. Faculty of Life Science and Technology, Kunming University of Science and Technology , Yunnan , China
4. Kunming Medical University , Kunming, Yunnan 650500 , China
5. Department of Biostatistics, Center for Global Health, School of Public Health, Nanjing Medical University , Nanjing , China