1. School of Public Health, University of Texas Health Science Center, Houston, Texas.
2. Departments of Pathology and Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina.
3. Department of Obstetrics and Gynecology, University of Massachusetts Medical Center, Worcester, Massachusetts.
4. Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
5. Department of Epidemiology and Biostatistics, Boston University School of Public Health, Boston, Massachusetts.
6. Department of Obstetrics and Gynecology, University of Chicago, Chicago, Illinois.
7. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland.
8. Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas.
9. Department of Obstetrics and Gynecology, Methodist Hospital, Houston, Texas.
10. Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas.