1. Department of Paediatrics, Imperial College, London W12ONN, United Kingdom.
2. School of Biological Sciences, Royal Holloway-University of London, Egham TW20 0EX, United Kingdom.
3. Centre for Neurological and Neuromuscular Disorders, Australian Neuromuscular Research Institute, University of Western Australia, Perth WA6009, Australia.
4. Center for Human and Clinical Genetics, Leiden University Medical Center, 2300RC Leiden, The Netherlands.
5. Prosensa, 2333AL Leiden, The Netherlands.