1. Institute of Human Genetics; University Hospital Cologne; Köln Germany
2. Department of Pediatrics; Baylor College of Medicine; Houston Texas
3. Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital; Houston Texas
4. Department of Molecular and Human Genetics; Baylor College of Medicine; Houston Texas
5. Department of Molecular Physiology and Biophysics; Baylor College of Medicine; Houston Texas
6. Department of Human Molecular Genetics; Max Planck Institute for Molecular Genetics; Berlin Germany
7. Department of Clinical Genetics; Sydney Children's Hospital; Sydney Australia
8. Neuroscience Research Australia (NeuRA); University of New South Wales; Sydney Australia
9. Division of Genetics, Birth Defects and Metabolism; Ann & Robert H. Lurie Children's Hospital of Chicago; Chicago Illinois
10. Department of Pediatrics; Northwestern University Feinberg School of Medicine; Chicago Illinois
11. Division of Medical Genetics and Metabolism; Children's Hospital of The King's Daughters; Norfolk Virginia
12. Department of Genetics; University of Alabama at Birmingham; Birmingham Alabama
13. Department of Social Pediatrics; Wroclaw Medical University; Poland
14. Department of Pediatrics; LSU Health Sciences Center and Children's Hospital; New Orleans Louisiana
15. Center for Molecular Medicine Cologne; University of Cologne; Köln Germany
16. Center for Rare Diseases; University Hospital Cologne; Köln Germany