1. Department of Neurology, University Hospital of Lille, Lille, France
2. Department of Neurology, Helsinki University Central Hospital, Helsinki, Finland
3. Department of Neurology, University Hospital of Brescia, Brescia, Italy
4. Department of Neurology, University Hospital of Basel, Basel, Switzerland
5. Department of Neurology, Schmieder-Klinik Heidelberg, Heidelberg, Germany
6. Department of Neurology, University Hospital of Heidelberg, Heidelberg, Germany
7. Department of Neurology, Paris Descartes University Sainte-Anne Hospital, Paris, France
8. Department of Neurology, Saint-George's University of London, London, UK
9. Department of Neurology, Erasmus University Hospital of Brussels, Brussels, Belgium
10. Department of Neurology, University Hospital of Perugia, Perugia, Italy
11. Department of Neurology, University Hospital of Milano, Milano, Italy
12. Department of Neurology, Ludwigshafen Hospital, Ludwigshafen, Germany
13. Department of Neurology, University Hospital of Istanbul, Istanbul, Turkey
14. Inserm, U744, Pasteur Institute, Lille, France