*Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL
†Multiple Sclerosis Center, Swedish Neuroscience Institute and University of Washington Medical Center
‡Division of Gerontology and Geriatric Medicine, University of Washington Harborview Medical Center
∥Psychosocial and Community Health, School of Nursing, University of Washington
#Group Health Research Institute, Group Health Cooperative, Seattle, WA
§Children’s Center for Neuropsychological Rehabilitation, Barrow Neurological Institute, Phoenix, AZ
¶Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA
Supported by NIH (AG09769-10).
The authors declare no conflicts of interest.
Reprints: Amy R. Borenstein, PhD, Department of Epidemiology and Biostatistics, College of Public Health, MDC-56, University of South Florida, 13201 Bruce B. Downs Blvd, Tampa, FL 33612-3805 (e-mail: [email protected]).
Received March 19, 2013
Accepted June 13, 2013