[1] Canc Prevent Inst Calif, Fremont, CA 94538 USA
[2] NCI, Control & Populat Sci, NIH, Bethesda, MD 20892 USA
[3] Stanford Univ, Dept Med, Sch Med, Stanford, CA 94305 USA
[4] Univ Connecticut, Dept Human Dev & Family Studies, Storrs, CT USA
[5] Univ Iowa, Dept Epidemiol, Iowa City, IA USA
[6] Univ Texas Hlth Sci Ctr San Antonio, Dept Epidemiol & Biostat, San Antonio, TX 78229 USA
[7] NCI, Outcomes Res Branch, Appl Res Program, Div Canc Control & Populat Sci,NIH, Bethesda, MD 20892 USA
[8] Stanford Univ, Sch Med, Dept Hlth Res & Policy, Stanford, CA 94305 USA