1. Framingham Heart Study; Framingham Massachusetts USA
2. Population Sciences Branch, Division of Intramural Research; National Heart, Lung, and Blood Institute, National Institutes of Health; Bethesda Maryland USA
3. Department of Neurology; Boston University School of Medicine; Boston Massachusetts USA
4. Department of Anatomy and Neurobiology; Boston University School of Medicine; Boston Massachusetts USA
5. Department of Epidemiology; Boston University School of Public Health; Boston Massachusetts USA
6. Department of Epidemiology; University of Alabama at Birmingham; Birmingham Alabama USA
7. Department of Genetics and Pharmacogenomics; Merck Research Labs; Boston Massachusetts USA