1 University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania. Department of Rehabilitation at Mount Sinai Hospital, New York, New York. University of Miami, Miami, Florida. Central Texas Rehabilitation Hospital, Austin, Texas. Department of Physical Medicine & Rehabilitation, Vanderbilt University Medical Center, Nashville, Tennessee. Department of Physical Medicine & Rehabilitation, Vanderbilt University Medical Center, University of Puerto Rico, San Juan, Puerto Rico. From the University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (AS); Department of Rehabilitation at Mount Sinai Hospital, New York, New York (AB); University of Miami, Miami, Florida (MW); Central Texas Rehabilitation Hospital, Austin, Texas (PS); Department of Physical Medicine & Rehabilitation, Vanderbilt University Medical Center, Nashville, Tennessee (CG); Department of Physical Medicine & Rehabilitation, Vanderbilt University Medical Center, University of Puerto Rico, San Juan, Puerto Rico (WF); and Department of Medicine, Division of Physical Medicine and Rehabilitation, University of Toronto, Toronto, Ontario, Canada (DK).