1. Centre for Neurological Learning Disabilities, Kempenhaeghe, Heeze, The Netherlands
2. School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands
3. Department of Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Centre, Maastricht, The Netherlands
4. Department of Neurology, Maastricht University Medical Centre, Maastricht, The Netherlands
5. Dutch Duchenne Centre, Leiden, The Netherlands