1. From the Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA (Y.M., D.B., A.H., S.P.)
2. Department of Biology, Brown University, Providence, RI (A.S.)
3. Department of Neurology, Massachusetts General Hospital Stroke Research Center, Harvard Medical School, Boston (A.V.)
4. Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston (D.B.)
5. Department of Epidemiology (M.W.V., A.H.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.
6. Department of Radiology and Nuclear Medicine (M.W.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.