1. Department of Obstetrics & Gynecology, Massachusetts General Hospital, Boston Massachusetts
2. Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Department of Obstetrics, Gynecology & Reproductive Sciences, University of California, San Francisco, California
4. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Departments of Epidemiology and Global Health, School of Public Health, University of Washington, Seattle, Washington
6. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Pittsburgh and the Magee Women’s Research Institute, Pittsburgh, Pennsylvania