[1] Univ Pittsburgh, Div Canc Prevent & Populat Sci, Pittsburgh, PA 15232 USA
[2] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Epidemiol, Pittsburgh, PA 15232 USA
[3] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[4] NIA, Lab Epidemiol Demog & Biometry, Intramural Res Program, Bethesda, MD 20892 USA
[5] Univ Tennessee, Ctr Hlth Sci, Dept Prevent Med, Memphis, TN 38163 USA
[6] Vrije Univ Amsterdam, Inst Res Extramural Med, VU Med Ctr, Amsterdam, Netherlands
[7] Vrije Univ Amsterdam, Inst Res Extramural Med, Inst Hlth Sci, Amsterdam, Netherlands