[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Med, Stat Core, Sch Med, Los Angeles, CA 90095 USA
[3] Univ Calif San Francisco, Dept Family & Community Med, San Francisco, CA USA
[4] Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, San Francisco, CA USA
[5] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA USA
[6] Latina Canc Inst, San Jose, CA USA
[7] Amer Sexual Hlth Assoc, Natl Cerv Canc Coalit, Res Triangle Pk, NC USA
[8] Univ Calif Davis Hlth, Hlth Informat, Davis, CA USA
[9] Univ Calif Irvine, Dept Obstet & Gynecol, Irvine, CA 92717 USA