George F Sawaya1. 1. Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, 550 16(th) Street, CA 94143; Epidemiology & Biostatistics, University of California, San Francisco, 550 16(th) Street, CA 94143; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, 550 16(th) Street, CA 94143. Electronic address: George.sawaya@ucsf.edu.