1. Rehabilitation Medicine DepartmentClinical Center, National Institutes of Health Bethesda MD
2. Department of Human Health and Nutritional SciencesUniversity of Guelph Guelph Canada
3. Department of Health Administration and PolicyCollege of Health and Human Services, George Mason University Fairfax VA
4. Department of Medicine, Division of Physical Medicine and RehabilitationUniversity of Toronto Toronto Canada
5. Department of Bioengineering, Center for Adaptive Systems of Brain‐Body InteractionsGeorge Mason University Fairfax VA
6. Department of Health Administration and Policy, Center for the Study of Chronic Illness and Disability, College of Health and Human Services, Center for Adaptive Systems of Brain‐Body InteractionsGeorge Mason University Fairfax VA