1. Department of Neurology, Donders Centre for NeuroscienceRadboud University Medical Centre Nijmegen The Netherlands
2. Department of Rehabilitation, Donders Centre for NeuroscienceRadboud University Medical Centre Nijmegen The Netherlands
3. Department of Human GeneticsLeiden University Medical Centre Leiden The Netherlands
4. Department of Clinical GeneticsLeiden University Medical Centre Leiden The Netherlands
5. Department of OphthalmologyRadboud University Medical Centre Nijmegen The Netherlands