1. Second Department of Neurology, National and Kapodistrian University of Athens, School of Medicine, “Attikon” University Hospital, Athens, Greece
2. Department of Neurology, The University of Tennessee Health Science Center, Memphis, TN, USA
3. An Affiliate of Merck KGaA, Merck A.E., Marousi, Greece
4. Multiple Sclerosis Center (MSC), Department of Neurology, Neurocenter of Southern Switzerland, Lugano, Switzerland
5. Faculty of Biomedical Sciences, Università Della Svizzera Italiana (USI), Lugano, Switzerland
6. Department of Neurology, Oslo University Hospital and Faculty of Medicine, University of Oslo, Oslo, Norway
7. Department of Neurology, Medical University of Bialystok, Bialystok, Poland
8. Dipartimento di Neurologia, Centro Regionale Sclerosi Multipla, Napoli, Italy
9. Hospital Dia Neurologia, Hospital Garcia de Orta, Pragal, Portugal
10. Second Department of Neurology, Special Unit for Biomedical Research and Education (S.U.B.R.E.), School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece