1. Department of Guangxi Key Laboratory of AIDS Prevention and Treatment, School of Public Health, Guangxi Medical University, Nanning, China.
2. Department of AIDS Research, State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China.
3. Department of Epidemiology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, China.
4. Department of Transfusion Medicine, the Fifth Medical Centre, Chinese PLA (People’s Liberation Army) General Hospital, Beijing, China.