1. Baylor College of Medicine, Houston, Texas
2. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
3. Department of Neurological Surgery, University of Washington, Seattle
4. Department of Biostatistics, University of Washington, Seattle
5. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee
6. Department of Neurology, Medical College of Wisconsin, Milwaukee
7. University of California, San Diego
8. University of California, San Francisco
9. Spaulding Rehabilitation Center, Boston, Massachusetts
10. Massachusetts General Hospital, Boston
11. Department of Neurology, University of Pennsylvania, Philadelphia
12. Department of Neurosurgery, University of Pittsburgh, Pittsburgh
13. University of Cincinnati, Ohio
14. University of Maryland, College Park
15. University of Miami, Miami, Florida
16. Ohio State University, Columbus
17. University of Southern California, Los Angeles, California
18. Department of Rehabilitation Medicine, University of Washington, Seattle
19. MassGeneral Hospital for Children, Boston, Massachusetts
20. Virginia Commonwealth University, Richmond, Virginia
21. TIRR Memorial Hermann, Houston, Texas
22. University of Michigan, Ann Arbor
23. Vanderbilt University, Nashville, Tennessee
24. University of Texas Southwestern Medical School, Dallas
25. Indiana University, Bloomington
26. University of Texas at Austin, Austin
27. University of Florida, Gainesville
28. Harvard Medical School, Boston, Massachusetts