1 Neuromuscular Reference Centre for Children, Department of Paediatrics, University Hospitals Leuven, Leuven, Belgium.
2 Department of Development and Regeneration, KU Leuven, Leuven, Belgium.
3 MDUK Neuromuscular Center, Department of Paediatrics, University of Oxford, Oxford, UK.
4 Division of Child Neurology, Centre de Références des Maladies Neuromusculaires, Department of Paediatrics, University Hospital Liège & University of Liège, Liège, Belgium.