[1] NHLBI, Framingham Heart Study, Framingham, MA 01702 USA
[2] Tufts Med Ctr, Dept Med, Div Cardiol, Boston, MA USA
[3] NHLBI, Ctr Populat Studies, Bethesda, MD 20892 USA
[4] Boston Univ, Gen Internal Med Sect, Boston, MA 02215 USA
[5] Boston Univ, Sch Med, Boston, MA 02215 USA
[6] Boston Univ, Sch Publ Hlth, Boston, MA 02215 USA
[7] Boston Univ, Dept Neurol, Boston, MA 02215 USA
[8] NHLBI, Div Prevent & Populat Sci, Bethesda, MD 20892 USA