1. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
2. Department of Epidemiology, Columbia University, Mailman School of Public Health, New York, New York.
3. Department of Biostatistics, Columbia University, Mailman School of Public Health, New York, New York.
4. Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas.
5. TBI and Stroke Rehabilitation Research Program, National Center for Medical Rehabilitation Research, National Institute of Child Health and Human Development, Bethesda, Maryland.
6. Department of Neurosurgery, University of Maryland Hospital South, Baltimore, Maryland.
7. Department of Neurosurgery and Neurotrauma Division, Semmes-Murphey Clinic, University of Tennessee Health Science Center, Memphis, Tennessee.
8. Department of Neurological Surgery and Biostatistics, University of Washington, Seattle, Washington.
9. Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, Alabama.
10. Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
11. Department of Anatomy and Neurobiology, Virginia Commonwealth University, Richmond, Virginia.
12. Department of Neurosurgery, Thomas Jefferson University, Philadelphia, Pennsylvania.