1. Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC (P.W.D., C.B., M.S., S.C., M.R.).
2. School of Nursing, University of North Carolina at Wilmington (B.J.L.).
3. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill (A.M.J.).
4. School of Nursing, Duke University, Durham, NC (J.P.B.).
5. Department of Rehabilitation Medicine, MedStar National Rehabilitation Network and Georgetown University School of Medicine, Washington, DC (R.D.Z.).
6. Department of Rehabilitation Medicine, Cornell University, Weill Cornell Medical College, New York, NY (J.S.).