1. School of Public Health (Shenzhen), Sun Yat-sen University, Shenzhen, China
2. Tianjin Hexi District Center for Disease Control and Prevention, Tianjin, China
3. Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
4. School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
5. Guangzhou Eighth People’s Hospital, Guangzhou Medical University, Guangzhou, China
6. Department of AIDS/STD Control and Prevention, Chongqing Center for Disease Control and Prevention, Chongqing, China
7. Department of AIDS/STD Control and Prevention, Tianjin Center for Disease Control and Prevention, Tianjin, China
8. Wuxi Municipal Center for Disease Control and Prevention, Wuxi, China