1. Department of Neurology Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
2. Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research and Center of Neurology University of Tübingen Tübingen Germany
3. German Center for Neurodegenerative Diseases (DZNE) Tübingen Germany
4. Department of Pediatric Neurology University Children's Hospital Tübingen Germany
5. ICCTR Biostatistics and Research Design Center Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
6. Department of Neurology University of Michigan Ann Arbor Michigan USA
7. Department of Neurology and Rehabilitation Medicine Texas Scottish Rite Hospital, University of Texas Southwestern Medical Center Dallas Texas USA
8. Department of Molecular & Human Genetics Baylor College of Medicine Houston Texas USA
9. Functional and Applied Biomechanics Section, Department of Rehabilitation Medicine Clinical Center, National Institutes of Health Bethesda Maryland USA
10. Undiagnosed Diseases Program National Institutes of Health Bethesda Maryland USA
11. Movement Disorders Division, Department of Neurology Massachusetts General Hospital, Harvard Medical School Boston Massachusetts USA
12. National Institute of Neurological Disorders and Stroke, National Institutes of Health Bethesda Maryland USA
13. Movement Disorders Program, Department of Neurology Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
14. The Manton Center for Orphan Disease Research, Boston Children's Hospital Boston Massachusetts USA
15. Intellectual and Developmental Disabilities Research Center, Boston Children's Hospital Boston Massachusetts USA