1. Department of Obstetrics, Gynecology and Reproductive Sciences and Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California;
2. Department of Quality and Utilization, Kaiser Permanente Medical Care Program, Oakland, California;
3. Division of Gynecologic Oncology, Kaiser Permanente Medical Care Program, Sacramento, California;
4. Division of Research, Kaiser Permanente Medical Care Program, Oakland, California; and
5. Lombardi Cancer Center, and Cancer and Aging Research, Georgetown University Medical Center, Washington, DC.