1. Unit of Medical Genetics, University of Ferrara, Ferrara, Italy.
2. Department of Scienza e Tecnologia del Farmaco, University of Torino, Torino, Italy.
3. NIHR Biomedical Research Centre, University College London, Great Ormond Street Institute of Child Health and Great Ormond Street Hospital NHS Trust, London, United Kingdom.
4. The Dubowitz Neuromuscular Centre, UCL Street Institute of Child Health, London, United Kingdom.