1. Department of Neurology; University Medical Centre Maastricht; Maastricht The Netherlands
2. Department of Neurology; St Elizabeth's Medical Centre; Tufts University School of Medicine; Boston MA USA
3. Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht The Netherlands
4. Department of Neurology; Havenziekenhuis; Rotterdam The Netherlands
5. Department of Neurology; Erasmus Medical Centre Rotterdam; Rotterdam The Netherlands
6. Department of Neurology; Johns Hopkins School of Medicine; Baltimore MD USA
7. Department of Neurology; Rudolf Magnus Institute of Neuroscience University Medical Centre Utrecht; Utrecht The Netherlands
8. Department of Neurology; Spaarne Hospital; Hoofddorp The Netherlands