1. Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, and Rehabilitation Hospital of Indiana, Indianapolis, Indiana.
2. Department of Physical Medicine and Rehabilitation, Carolinas Rehabilitation, Carolinas HealthCare System, Charlotte, North Carolina.
3. TIRR Memorial Hermann, Houston, Texas.
4. Spaulding Rehabilitation Hospital, Harvard Medical School, Massachusetts General Hospital, and Brigham and Women's Hospital, Boston, Massachusetts.
5. University of Washington, Seattle, Washington.
6. University of Texas Southwestern Medical School, Dallas, Texas.
7. Department of Physical Medicine and Rehabilitation, The Ohio State University, Columbus, Ohio.