1. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands,
2. Bayer-Schering Pharma, Berlin, Germany
3. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands; Department of Neurosciences, Psychiatric and Anaesthesiological Sciences, University of Messina, Italy
4. Bayer-Schering Pharma, Berlin, Germany; Department of Neurology, University Hospital of Bonn, Germany
5. Department of Clinical Epidemiology and Biostatistics, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
6. Neurology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands; Neurology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
7. Department of Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands