*HIV/AIDS Prevention and Control Division, Shenzhen Center for Disease Control and Prevention, Shenzhen, Guangdong, China
†Department of AIDS and STD, Beijing Center for Disease Control and Prevention, Beijing, China
‡Department of AIDS and STD, Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
§Pathogen Diagnostic Center, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
Supported in part by grants from the National Natural Science Foundation of China (81270043, 81071391, and 30901224), Key Scientific and Technological Program of China, and National Science and Technology Major Project for Infectious Disease Control and Prevention (2012ZX10001-002). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the article.
The authors have no conflicts of interest to disclose.