1. From the Department of Epidemiology, Michigan State University, East Lansing (M.R.)
2. School of Public Health, University of Michigan, Ann Arbor (L.L.)
3. Roudebush VA Medical Center, Indianapolis, IN (L.W.)
4. Neurological Institute, Cleveland Clinic, OH (I.K.)
5. Division of General Internal Medicine, Department of Medicine, University of Toronto, ON, Canada (M.K.)
6. Shirley Ryan AbilityLab, Northwestern University, Chicago, IL (A.D.)
7. Duke Clinical Research Institute, Durham, NC (J.P.-B.).