1. Department of Chronic Communicable Disease, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, People’s Republic of China;
2. Department of Epidemiology, School of Public Health, Nanjing Medical University, Nanjing, People’s Republic of China;
3. The Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, People's Republic of China;
4. Department of Tuberculosis, The Third People’s Hospital of Zhenjiang Affiliated to Jiangsu University, Zhenjiang, People’s Republic of China;
5. Department of Epidemiology and Biostatistics, School of Public Health, University of Georgia, Athens, Georgia; and
6. Department of Epidemiology, School of Public Health, Boston University, Boston, Massachusetts