1. Neuromuscular Unit, Neuropaediatrics DepartmentInstitut de Recerca Hospital Universitari Sant Joan de Deu Barcelona Spain
2. Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), ISCIII Barcelona Spain
3. Département de Génétique et ProcréationCHU de Grenoble Alpes Grenoble Cedex 9 France
4. Neuromuscular Unit, Department of Pediatric Neurology, Intensive Care and RehabilitationRaymond Poincaré University Hospital (AP‐HP; UVSQ Paris Saclay) Garches France
5. Department of Medical RadiologyRaymond Poincaré University Hospital (AP‐HP; UVSQ Paris Saclay) Garches France
6. Department of RadiologyHospital Universitari Sant Joan de Deu Barcelona Spain
7. Department of PathologyHospital Sant Joan de Deu Barcelona Spain
8. Confocal Microscopy Unit, Department of PathologyHospital Sant Joan de Déu Barcelona Spain
9. Department of Genetic and Molecular MedicineHospital Sant Joan de Déu Barcelona Spain
10. Laboratory of Neurogenetics and Molecular MedicineInstitut de Recerca Sant Joan de Déu Barcelona Spain
11. Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Barcelona Spain
12. Division of PediatricsUniversity of Barcelona School of Medicine Barcelona Spain
13. Centro de Investigación Biomédica en Salud Mental (CIBERSAM) Barcelona Spain
14. Department of RadiologyCHU de Grenoble Alpes Grenoble France
15. Department of Neuropediatrics and Muscle DisordersMedical Center – University of Freiburg, Faculty of Medicine Freiburg Germany
16. Centro Nacional de Análisis Genómico (CNAG‐CRG), Center for Genomic RegulationBarcelona Institute of Science and Technology (BIST) Barcelona Spain
17. Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada and Division of Neurology, Department of MedicineThe Ottawa Hospital Ottawa Ontario Canada