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Affiliations

• ¹ Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, Pennsylvania.
• ² Department of Obstetrics and Gynecology, Duke University, Durham.
• ³ Social, Statistical and Environmental Sciences Group, RTI International, Research Triangle Park, North Carolina.
• ⁴ Department of Obstetrics, Gynecology & Reproductive Sciences, University of California San Diego, La Jolla, California.
• ⁵ Department of Obstetrics and Gynecology, Brown University, Providence, Rhode Island.
• ⁶ Department of Obstetrics and Gynecology, University of New Mexico, Albuquerque, New Mexico.
• ⁷ Department of Women's Health, Dell Medical School, University of Texas, Austin, Texas.
• ⁸ Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, Alabama.
• ⁹ Obstetrics, Gynecology and Women's Health Institute, Cleveland Clinic, Cleveland, Ohio.
• ¹⁰ Department of Urology, University of Pittsburgh, Pittsburgh, Pennsylvania.
• ¹¹ Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland.