1. Department of Family and Community Medicine, University of California-San Francisco, San Francisco, California
2. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California-San Francisco, San Francisco, California
3. Department of Epidemiology and Biostatistics, University of California-San Francisco, San Francisco, California
4. Department of Urology, University of California-San Francisco, San Francisco, California
5. Division of Research, Kaiser Permanente, Oakland, California