1. National Institute of Neurological Disorders and Stroke Intramural Program National Institutes of Health, Bethesda MD USA
2. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore MD USA
3. Mayo Clinic Rochester MN USA
4. Departments of Radiology and Physics University of British Columbia Vancouver British Columbia Canada
5. Department of Mental Health and Center on Aging and Health Johns Hopkins Bloomberg School of Public Health, and Department of Psychiatry and Behavioral Science, Johns Hopkins School of Medicine Baltimore MD USA
6. Department of Radiology Washington University St Louis MO USA
7. Division of Public Health Sciences Wake Forest University Health Sciences, Winston‐Salem, NC, USA
8. Department of Gerontology and Geriatric Medicine Wake Forest School of Medicine Winston‐Salem NC USA
9. National Institute on Aging Intramural Program National Institutes of Health, Bethesda MD USA
10. Department of Medicine University of Mississippi Medical Center Jackson MS USA