1. Royal Holloway, University of London, Surrey, UK.
2. Careggi University Hospital, Florence, Italy.
3. Meander Medisch Centrum, Amersfoort, The Netherlands.
4. Universite de Bordeaux, France.
5. Yeshiva University, Bronx, NY, USA and Holy Name Hospital Multiple Sclerosis Center, Teaneck, NJ, USA.
6. Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden.
7. Masku Neurological Rehabilitation Centre, Masku, Finland.
8. Heinrich-Heine-Universitat, Duesseldorf, Germany.
9. Albert Einstein College of Medicine New York, USA.
10. University of Basel, Switzerland.
11. University of Chicago, USA.
12. Jacobs Neurological Institute, New York, USA.