1. Department of Neurology, Klinik Hennigsdorf, Hennigsdorf, Germany,
2. Department of Neurology, Southern General Hospital NHS Trust, Glasgow, UK
3. Servicio de Neurologia, Hospital Clinico Universitario de Valencia, Valencia, Spain
4. Department of Neurology, J. A. Reiman Teaching Hospital, Presov, Kosice, Slovak Republic
5. Department of Neurology, University Hospital ak Derera, Bratislava, Slovak Republic
6. Bayer Schering Pharma AG, Berlin, Germany