1. 1 The Dubowitz Neuromuscular Centre, UCL, Institute of Child Health, London WC1N 1EH, UK
2. 2 Don Carlo Gnocchi Onlus Foundation, 20148, Italy
3. 3 Section of Medical Genetics, Department of Experimental and Diagnostic Medicine, University of Ferrara, Ferrara 44100 Italy
4. 4 Institute of Genetic Medicine, Newcastle University, Newcastle NE1 3BZ, UK
5. 5 Department of Neurology, Leiden University Medical Centre, 2300 RC Leiden, The Netherlands
6. 6 Department of Human Genetics, Leiden University Medical Centre, 2300 RC Leiden, The Netherlands
7. 7 Institute of Neurology, Catholic University, Rome 00168, Italy