1. From the Stroke Program (D.L.B., E.C., L.B.M., L.D.L.), University of Michigan Medical School, University of Michigan, Ann Arbor
2. Department of Biostatistics (F.S.-K., S.K.), School of Public Health, University of Michigan, Ann Arbor
3. Sleep Disorders Center and Department of Neurology (R.D.C.), University of Michigan Medical School, University of Michigan, Ann Arbor
4. Department of Epidemiology (E.C., L.B.M., L.D.L.), School of Public Health, University of Michigan, Ann Arbor
5. University Health Network-Toronto Rehabilitation Institute (A.Y.), University of Toronto, ON
6. Institute of Biomaterials and Biomedical Engineering (A.Y.), University of Toronto, ON
7. Department of Physical Medicine and Rehabilitation, CHRISTUS Spohn Hospital, Corpus Christi, TX (S.T.).