Affiliation: | 1. University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642;2. Washington Hospital Center Department of Obstetrics and Gynecology, 110 Irving Street, NW Suite 5B-63, Washington, DC 20010;3. University of California, San Francisco, Department of Obstetrics, Gynecology and Reproductive Sciences, 1001 Potrero Avenue, Ward 6D, San Francisco, CA 94110;4. University of Michigan Department of Obstetrics and Gynecology, 1500 E Medical Center Drive, Ann Arbor, MI 48109 |