1. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington.
2. Department of Neurology, University of Washington, Seattle, Washington.
3. Department of Psychiatry and Behavioral Medicine, University of Washington, Seattle, Washington.
4. Department of Neurological Surgery, University of Washington, Seattle, Washington.
5. Craig Hospital, Denver, Colorado.
6. Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, Minnesota.
7. Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, Alabama.
8. Department of Neurology, University of Texas Southwestern Medical School, Dallas, Texas.
9. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, Virginia.
10. Department of Physical Medicine and Rehabilitation, Moss Rehab, Philadelphia, Pennsylvania.