1. 2nd Department of Neurology, Multiple Sclerosis Center, Aristotle University of Thessaloniki – School of Medicine, Thessaloniki, GR, Greece
2. 3rd Department of Psychiatry, Aristotle University of Thessaloniki – School of Medicine, Thessaloniki, GR, Greece
3. Department of Neurology, University of Cyprus – Medical School, Nicosia, CY, Cyprus
4. Ferkauf Graduate School of Psychology, Yeshiva University, Bronx, NY, USA
5. Multiple Sclerosis Center, Holy Name Medical Center, Teaneck, NJ, USA