1. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands,
2. Department of Epidemiology and Biostatistics, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
3. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands, Department of Physics and Medical Technology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
4. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
5. Neuroimaging Research Unit, Scientific Institute and University Ospedale San Raffaele, Milan, Italy
6. Department of Neurology, University Hospital, University of Basel, Switzerland
7. Medical University of Graz, Department of Neurology, Graz, Austria
8. Bayer-Schering Pharma, Berlin, Germany
9. Bayer-Schering Pharma, Berlin, Germany, Department of Neurology, University Hospital of Bonn, Germany
10. Bayer-Schering Pharma, Berlin, Germany, Department of Neurology, Heinrich-Heine University Dusseldorf, Germany
11. Department of Neurology, MS Center Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
12. Department of Epidemiology and Biostatistics, Vrije Universiteit Medical Center, Amsterdam, The Netherlands, Department of Neurology, MS Center Amsterdam, VU University Medical Center, Amsterdam, The Netherlands