1. 1 Department of Rehabilitation Medicine University of Washington, Seattle, WA, USA
2. 2 Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, AL, USA
3. 3 Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
4. 4 School of Nursing, University of North Carolina Greensboro, Greensboro, NC, USA
5. 5 Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, AL, USA
6. 6 Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA