1. HIV, Hepatitis and STI Unit, World Health Organization, Regional Office for the Western Pacific, Manila, The Philippines.
2. University of California San Francisco School of Medicine, San Francisco, California.
3. University of North Carolina Project-China, Guangzhou, P.R. China.
4. US Military HIV Research Program, Bethesda, Maryland.
5. Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland.
6. Institute of Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.