1. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee
2. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Charlestown, Massachusetts
3. Department of Physical Medicine and Rehabilitation, Massachusetts General Hospital, Boston
4. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts
5. Department of Neurological Surgery, University of Washington, Seattle
6. Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas
7. Department of Family Medicine and Public Health, University of California, San Diego, San Diego
8. Neurological Surgery, University of California, San Francisco, San Francisco
9. Department of Neurology, University of Pennsylvania, Philadelphia
10. Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
11. University of Cincinnati, Cincinnati, Ohio
12. University of Maryland, College Park
13. University of Miami, Coral Gables, Florida
14. University of Washington, Seattle
15. Ohio State University, Columbus
16. University of Southern California, Los Angeles
17. Massachusetts General Hospital for Children, Boston
18. Virginia Commonwealth University, Richmond
19. University of California, San Francisco, San Francisco
20. TIRR Memorial Hermann, Houston, Texas
21. Baylor College of Medicine, Houston, Texas
22. University of California, San Diego, La Jolla
23. University of Michigan, Ann Arbor
24. Vanderbilt University, Nashville, Tennessee
25. UT Southwestern Medical Center, Dallas, Texas
26. Indiana University, Bloomington
27. Uniformed Services University, Bethesda, Maryland
28. University of Pittsburgh, Pittsburgh, Pennsylvania
29. Massachusetts General Hospital, Boston
30. University of Texas, Austin
31. University of Florida, Gainesville
32. Harvard Medical School, Boston, Massachusetts