1. Department of Biostatistics and Sanders‐Brown Center on Aging University of Kentucky Lexington KY USA
2. Department of Medicine University of Washington Seattle WA USA
3. Department of Epidemiology University of California, San Francisco San Francisco CA USA
4. Department of Psychosocial and Community Health University of Washington Seattle WA USA
5. Department of Neurology Swedish Medical Center Seattle WA USA
6. Group Health Research Institute, Group Health Seattle WA USA