1. Department of Pediatrics Catholic Children's Hospital Wilhelmstift Hamburg Germany
2. Department of Pediatric Dermatology Catholic Children's Hospital Wilhelmstift Hamburg Germany
3. CHU Nantes, Service de génétique médicale, Centre de Référence des Maladies Neuromusculaires AOC, Filnemus, Euro‐NMD Nantes France
4. Nantes Université, CNRS, INSERM, l'Institut du Thorax Nantes France