1. Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.
2. Department of Biostatistics, University of Washington, Seattle, Washington, USA.
3. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington, USA.
4. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
5. Department of Anatomy and Neurobiology, Boston University, Boston, Massachusetts, USA.
6. Department of Psychiatry and Herbert Wertheim School of Public Health, Herbert Wertheim School of Public Health, University of California San Diego, La Jolla, California, USA.
7. Biostatistics Research Center, Herbert Wertheim School of Public Health, University of California San Diego, La Jolla, California, USA.
8. Department of Rehabilitation Medicine, Spaulding Rehabilitation Hospital, Harvard Medical School, Charlestown, Massachusetts, USA.
9. Department of Neurosurgery and Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
10. Brain and Spinal Injury Center, San Francisco, California, USA.
11. Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA.