1. Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine; Northwestern University; Chicago Illinois USA
2. Department of Neurology; The Ohio State University Wexner Medical Center; Columbus Ohio USA
3. Department of Physical Therapy; Institute of Health Professions, Massachusetts General Hospital; Boston Massachusetts USA
4. Department of Neurology; Center for Genomic Medicine, Massachusetts General Hospital; 185 Cambridge Street, Simches 5-240, Boston Massachusetts 02114 USA
5. Department of Neurology; University of Utah; Salt Lake City Utah USA
6. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore Maryland USA
7. Department of Pediatrics, School of Medicine and Public Health; University of Wisconsin; Madison Wisconsin USA
8. Connecticut Children's Medical Center; Hartford Connecticut USA
9. Department of Pediatrics; Duke University; Durham North Carolina USA
10. Department of Pediatrics; Hospital of the University of Cologne; Cologne Germany
11. Department of Pediatrics; Saint-Justine Hospital; Montreal Quebec Canada
12. Biochemistry and Medical Genetics; University of Manitoba; Winnepeg Manitoba Canada
13. Department of Molecular Pathology; The Ohio State University; Columbus Ohio USA
14. CBS Squared, Inc; Fort Washington Pennsylvania USA
15. Department of Bioinformatics; University of Utah; Salt Lake City Utah USA
16. Department of Neurology; State University of New York; Syracuse New York
17. Institute of Human Genetics, Center for Molecular Medicine Cologne, Center for Rare Diseases Cologne
18. Institute of Genetics; University of Cologne; Cologne Germany