1. Neuromuscular Reference Center, Department of Pediatrics, University Hospital Liege, University of Liege, 4000 Liege, Belgium
2. Biochemical Genetics Lab, Department of Humans Genetics, CHU of Liege, University of Liege, 4000 Liege, Belgium
3. MDUK Oxford Neuromuscular Centre, Department of Paediatrics, University of Oxford, Oxford OX1 3QR, UK