1. Department of Physical Therapy and Human Movement Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
2. Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
3. Department of Biostatistics, NeuroNEXT Data Coordinating Center, University of Iowa, Iowa City, IA, USA
4. Physical Therapy, UT Southwestern Medical Center, Dallas, TX, USA
5. Department of Neurology, Stanford University, Palo Alto, CA, USA
6. Neurology, Nationwide Children’s Hospital, Columbus, OH, USA
7. Physical Therapy, Oregon Health and Science University, Portland, OR, USA
8. Physical Therapy, Children’s Hospital Colorado, Aurora, CO, USA
9. Pi Beta Phi Rehabilitation Institute, Vanderbilt University Medical Center, Nashville, TN, USA
10. Neuromuscular Division, Washington University School of Medicine, St. Louis, MO, USA
11. Ultragenyx, Novato, CA, USA
12. The Department of Physical Therapy and Occupational Therapy Services, Boston Children’s Hospital, Boston, MA, USA
13. The Department of Neurology, Boston Children’s Hospital, Boston, MA, USA
14. Physical and Occupational Therapy, Children’s Mercy Hospital, Kansas City, MO, USA
15. SUNY Upstate Medical University, Syracuse, NY, USA
16. Physical Medicine and Rehabilitation, University of California – Davis, Davis, CA, USA
17. University of Utah, Salt Lake City, UT, USA
18. Departments of Neurology and Rehabilitation and Regenerative Medicine, Columbia University Medical Center, New York, NY, USA
19. Physical and Occupational Therapy, Duke Health, Durham, NC, USA
20. Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
21. Department of Biological Chemistry and Pharmacology, The Ohio State University Wexner Medical Center, Columbus, OH, USA