1. University of Pennsylvania, Philadelphia, Pennsylvania.
2. University of Pittsburgh, Pittsburgh, Pennsylvania.
3. FHI 360, Durham, North Carolina.
4. Division of AIDS/NIAID/NIH, Bethesda, Maryland.
5. Population Council, Center for Biomedical Research, New York, New York.
6. Microbicide Trials Network, Pittsburgh, Pennsylvania.
7. Fred Hutchinson Cancer Research Center, Seattle, Washington.
8. Johns Hopkins University School of Medicine, Baltimore, Maryland.
9. University of Alabama at Birmingham, Birmingham, Alabama.