1. Division of Child Neurology; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
2. University of California San Francisco; San Francisco California
3. University of Utah; Salt Lake City Utah
4. Stony Brook University; Stony Brook New York
5. Buffalo General Hospital; State University of New York at Buffalo; Buffalo New York
6. Loma Linda University Children's Hospital; Loma Linda California
7. Mayo Clinic; Rochester Minnesota
8. University of Alabama; Tuscaloosa Alabama
9. New York University Medical Center; New York New York
10. Boston Children's Pediatric MS Center; Boston Massachusetts
11. Cleveland Clinic; Cleveland Ohio
12. Washington University in St. Louis; St. Louis Missouri
13. Brigham and Women's Hospital; Harvard Medical School; Boston Massachusetts
14. Denver Children's Hospital; Denver Colorado
15. Texas Children's Hospital; Houston Texas
16. University of Texas Southwestern Medical Center; Dallas Texas
17. Children's National Medical Center; Washington District of Columbia
18. Lurie Children's Hospital; Chicago Illinois