1. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
2. University of Alabama at Birmingham, Birmingham, Alabama.
3. HIV Center for Clinical and Behavioral Studies, New York, New York.
4. Johns-Hopkins University School of Medicine, Baltimore, Maryland.
5. Statistical Center for HIV/AIDS Research and Prevention, Seattle, Washington.
6. Family Health International 360, Research Triangle Park, North Carolina.
7. Microbicide Trials Network, Pittsburgh, Pennsylvania.
8. Division of AIDS/NIAID/NIH, Bethesda, Maryland.
9. International Partnership for Microbicides, Silver Spring, Maryland.