1. Center for Biomedical Research, Population Council, New York, New York, USA
2. University of North Carolina at Chapel Hill, Department of Obstetrics & Gynecology, Chapel Hill, North Carolina, USA
3. UNC Project-Malawi, Kamuzu Central Hospital, Lilongwe, Malawi
4. Malawi College of Medicine, Department of Obstetrics & Gynecology, Blantyre, Malawi
5. U.S. Centers for Disease Control and Prevention, Division of HIV Prevention, Atlanta, Georgia, USA
6. University of North Carolina at Chapel Hill, Division of Infectious Diseases, Chapel Hill, North Carolina, USA
7. University of North Carolina at Chapel Hill, Department of Microbiology and Immunology, Chapel Hill, North Carolina, USA
8. Institute for Genome Sciences, University of Maryland School of Medicine, Health Sciences Facility III, Baltimore, Maryland, USA
9. Department of Microbiology and Immunology, University of Maryland School of Medicine, Health Sciences Facility III, Baltimore, Maryland, USA