1. Departments of Obstetrics, Gynecology, and Reproductive Sciences (T.T.P., J.C., D.W.E., T.L.B.S., F.B., H.H., J.C.I., L.C.G.), San Francisco, California 94143-0132
2. Department of Obstetrics and Gynecology and Clinical Research Center (T.P.P.), University of Oulu, FI-90220 Oulu University Hospital, Oulu, Finland
3. Anatomic Pathology (J.T.R.), University of California, San Francisco, San Francisco, California 94143-0132