1. Aaron Diamond AIDS Research Center, The Rockefeller University, New York, New York.
2. Institute of HIV/AIDS, The First Hospital of Changsha, Changsha, China.
3. School of Public Health, Fudan University, Shanghai, China.
4. Center for Infectious Diseases, Beijing You'an Hospital, Capital Medical University, Beijing, China.
5. Guangzhou Center for Disease Control and Prevention, Guangzhou, China.
6. Shanghai CSW & MSM Center, Shanghai, China.