1. Department of Obstetrics and Gynecology, University of California, Los Angeles, CA 90095.
2. Department of Obstetrics and Gynecology, Los Angeles Center of the Multicenter AIDS Cohort Study (MACS), University of California, Los Angeles, CA 90095.
3. Department of Biostatistics, University of California, Los Angeles, CA 90095.
4. Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095.
5. Department of Pediatrics, University of California, Los Angeles, CA 90095.
6. Departments of Microbiology, Immunology & Molecular Genetics, and Medicine, University of California, Los Angeles, CA 90095.
7. Departments of Epidemiology, School of Public Health, and the Los Angeles Center of the Multicenter AIDS Cohort Study (MACS), University of California, Los Angeles, CA 90095.
8. Departments of Obstetrics and Gynecology, Microbiology, Immunology & Molecular Genetics, Los Angeles Center of the Multicenter AIDS Cohort Study (MACS), University of California, Los Angeles, CA 90095.