1. Department of Neurology, UZ Brussel, Brussel, Belgium/Center for Neurosciences (C4N) Vrije Universiteit Brussel (VUB), Brussels, Belgium/ Department of Neurology, AZ Sint-Jan, Bruges, Belgium
2. Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands
3. Department of Neurology, UZ Brussel, Brussel, Belgium/Center for Neurosciences (C4N) Vrije Universiteit Brussel (VUB), Brussels, Belgium/Nationaal MS Centrum Melsbroek, Steenokkerzeel, Belgium
4. Department of Neurology, University Hospital Antwerp, Antwerp, Belgium
5. Department of Neurology, University Hospital Gent, Gent, Belgium
6. Department of Neurology, AZ Maria Middelares, Gent, Belgium
7. Department of Neurology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
8. Department of Neurology, Zuyderland Medisch Centrum, Sittard-Geleen, The Netherlands
9. Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
10. Department of Neurology, UZ Brussel, Brussel, Belgium/Center for Neurosciences (C4N) Vrije Universiteit Brussel (VUB), Brussels, Belgium/ Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands