1. Department of Neurology; Maastricht University Medical Center; Maastricht The Netherlands
2. Department of Clinical Genetics; Maastricht University Medical Center; Maastricht The Netherlands
3. Department of Neurology; Rudolf Magnus Institute of Neuroscience University Medical Center; Utrecht The Netherlands
4. Department of Neurology, St. Elizabeth's Medical Center; Tufts University School of Medicine; Boston MA USA
5. Department of Neurology; Hôpital de la Salpêtrière; Paris France
6. Department of Neurological Sciences; Milan University, Humanitas Clinical Institute; Rozzano Milan Italy
7. Department of Neurology; Cedars-Sinai Medical Center; Los Angeles California USA
8. Department of Neurology; Spaarne Hospital; Hoofddorp The Netherlands