1. Department of Obstetrics and Gynecology (R.O.B., M.N., C.R.N.), Stanford University, Stanford, California 94305
2. Department of Obstetrics, Gynecology, and Reproductive Sciences (S.T., A.E.H., K.C.V., L.C.G.), University of California, San Francisco, San Francisco, California 94143-0138
3. Department of Obstetrics and Gynecology (B.A.L.), University Medical Group, Greenville Hospital System, Greenville, South Carolina 29605