1. Latvian Biomedical Research and Study Centre Riga Latvia
2. Centre Hospitalier Universitaire de Québec Ville de Québec QC Canada
3. Department of Neurology–Uniklinikum CG Carus Dresden Germany
4. Department of Biochemistry and Molecular Biology University of Maryland School of Medicine Baltimore MD
5. Department of Clinical Genetics United Laboratories, Tartu University Hospital Tartu Estonia
6. Department of Clinical Genetics Institute of Clinical Medicine, Tartu University Tartu Estonia
7. Department of Chemistry and Biochemistry James Madison University Harrisonburg VA
8. Clinical Trials Unit, Office of the Clinical Director, NINDS Intramural Research Program National Institute of Neurological Disorders and Stroke, NIH Bethesda MD
9. Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch National Institute of Neurological Disorders and Stroke, NIH Bethesda MD