1. Department of Epidemiology; School of Public Health and Tropical Medicine, Southern Medical University; Guangzhou China
2. First School of Clinical Medicine; Southern Medical University; Guangzhou China
3. Scientific Research Department of Nanfang Hospital Affiliated to Southern Medical University; Guangzhou China
4. Major Infectious Disease Control Key Laboratory; Shenzhen Center for Disease Control and Prevention; Shenzhen China
5. Department of Health Statistics and Epidemiology; College of Public Health, Sun Yat-sen University; Guangzhou China
6. Department of Occupational and Environmental Health, Tongji Medical College; Huazhong University of Science and Technology; Wuhan China