1. Department of Neurology, University of Ulm, Ulm, Germany
2. Department of Neurology, Renaissance School of Medicine, Stony Brook University, Stony Brook, NY, USA
3. Department of Neurology, Pontificia Universidad Católica de Chile, Santiago, Chile
4. Multiple Sclerosis Center, ASST Spedali Civili Di Brescia, Montichiari (Brescia), Italy
5. Neuroimmunology Unit, Department of Neuroscience, Hospital Alemán, Buenos Aires, Argentina
6. Department of Neurology, Charles University, Prague, Czech Republic
7. Faculty of Medicine and University Hospital, Pilsen, Czech Republic
8. Faculty of Medicine and University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
9. Department of Neurosciences, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
10. MS Clinic Medicarte, Medellín, Colombia
11. Biogen, Cambridge, MA, USA, at the time of this study
12. Biogen, Cambridge, MA, USA