1. Division of Neurology, Department of Pediatrics University of Arkansas for Medical Sciences, Arkansas Children's Hospital Little Rock Arkansas
2. Center for Genetic Muscle Disorders, Kennedy Krieger Institute and Departments of Neurology and Neuroscience Johns Hopkins School of Medicine Baltimore Maryland
3. Department of Physical Medicine and Rehabilitation University of Colorado School of Medicine Aurora Colorado
4. Department of Physical Medicine and Rehabilitation and Department of Pediatrics University of California Davis Health System Sacramento California
5. Department of Pediatrics University of Iowa Carver College of Medicine Iowa City Iowa
6. Department of Neurology and Pediatrics University of Colorado School of Medicine Aurora Colorado
7. Department of Pediatrics and Neurology University of Massachusetts Medical School Worcester Massachusetts
8. Department of Neurology University of Rochester Medical Center Rochester New York
9. Department of Neurology University of California Los Angeles Los Angeles California
10. Department of Pediatrics and Neurology University of Utah School of Medicine Salt Lake City Utah
11. Division of Neurology, Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago Northwestern University Feinberg School of Medicine Chicago Illinois
12. Division of Neurology, Department of Pediatrics Duke University Medical Center Durham North Carolina
13. Division of Neurology, Department of Pediatrics Children's Hospital of The King's Daughters Norfolk Virginia
14. Division of Neurology, Department of Pediatrics Nationwide Children's Hospital, The Ohio State University College of Medicine Columbus Ohio