1. Dubowitz Neuromuscular Centre and MRC Centre for Neuromuscular Diseases, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital for Children Foundation Trust, London, UK
2. Institute of Genetic Medicine, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
3. Department of Pediatrics, University of Oxford, Oxford, UK
4. Peadiatric Neurology, Catholic University, Rome, Italy