1. Department of Obstetrics and Gynecology, Duke University School of Medicine, Durham, North Carolina.
2. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.
3. Department of Gynecology and Obstetrics, Emory University School of Medicine, Faculty Office Building, Atlanta, Georgia.
4. Rollins School of Public Health, Emory University, Atlanta, Georgia.