1. Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
2. Department of Neurology, Donders Institute for Brain, Cognition, and Behavior, Radboud University Medical Center, Nijmegen, The Netherlands
3. Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands
4. Department of Pediatric Neurology, Radboud University Medical Center, Nijmegen, The Netherlands
5. Service de Génétique Humaine, CHU de Liège, Liège, Belgium
6. Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands
7. Department of Pediatrics and Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
8. Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
9. Center de Génétique Humaine, Clinique Universitaires Saint Luc, Bruxelles, Belgium
10. Department of Clinical Genetics, Amsterdam University Medical Centre, Amsterdam, The Netherlands
11. Department of Neurology, Amsterdam Medical Center, Amsterdam UMC, University of Amsterdam, Neuroscience institute, Amsterdam, The Netherlands
12. Division of Human Genetics, National Health Laboratory Service and School of Pathology, Faculty of Health Sciences, The University of the Witwatersrand, Johannesburg, South Africa
13. Department of Clinical Genetics, Rigshospitalet Copenhagen, Denmark
14. Department of Clinical Genetics, Maastricht University Medical Center+, Maastricht, The Netherlands
15. Department of Child Neurology and Unit for Congenital and Inherited Neuromuscular Disorders, Oslo University Hospital, Oslo, Norway
16. Center de Génétique Humaine, Institut de Pathologie et de Génétique, Gosselies, Belgium
17. Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, The Netherlands
18. Department of Neurology, Rigshospitalet, Copenhagen, Denmark