1. School of Public Health, Guangxi Medical University, Nanning, Guangxi, China.
2. Institute for HIV/AIDS Control and Prevention, Guangxi Zhuang Autonomous Regional Center for Disease Control and Prevention, Nanning, Guangxi, China.
3. Project Department, Liuzhou Center for Disease Control and Prevention, Liuzhou, Guangxi, China.
4. Guangxi Key Laboratory of AIDS Prevention and Treatment, Guangxi Medical University, Nanning, Guangxi, China.
5. National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
6. Health and Family Planning Commission of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China.