1. Division of Neurology Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
2. Reata Pharmaceuticals Dallas Texas USA
3. Department of Neurology Medical University Innsbruck Innsbruck Austria
4. Victorian Clinical Genetics Services Murdoch Children's Research Institute Parkville Victoria Australia
5. University College London Hospital London United Kingdom
6. Department of Neurology Ohio State University College of Medicine Columbus Ohio USA
7. IRCCS–Istituto Neurologico Carlo Besta Milan Italy
8. Department of Pediatrics University of Iowa Carver College of Medicine Iowa City Iowa USA
9. Department of Neurology University of California Los Angeles Los Angeles California USA
10. Department of Neurology, McKnight Brain Institute University of Florida Health System Gainesville Florida USA
11. Department of Neurology Emory University School of Medicine Atlanta Georgia USA
12. Department of Neurology University of South Florida Ataxia Research Center Tampa Florida USA