[1] Univ Maryland, Sch Publ Hlth, Dept Epidemiol & Biostat, College Pk, MD 20742 USA
[2] Kaiser Permanente NW, Ctr Hlth Res, Portland, OR USA
[3] Stanford Univ, Sch Med, Stanford Prevent Res Ctr, Stanford, CA 94305 USA
[4] Duke Univ, Med Ctr, Sch Med, Dept Med Endocrinol,Duke Acad Program Womens Hlth, Durham, NC 27710 USA
[5] Pennington Biomed Res Ctr, Baton Rouge, LA USA
[6] Johns Hopkins Med Inst, Baltimore, MD 21205 USA