1. Department of Neurology, Laboratory of Neurogenetics, Faculty of Medicine, University of Thessaly, University Hospital of Larissa, Larissa, Greece
2. Department of Neurology, Medical School, University of Cyprus, Nicosia, Cyprus
3. Multiple Sclerosis Center, 2nd Department of Neurology, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Lab of Cognitive Neuroscience, School of Psychology, Aristotle University of Thessaloniki, Thessaloniki, Greece
5. Department of Speech and Language Therapy, University of Ioannina, Ioannina, Greece
6. Department of Neurology, University of Patras, Patras, Greece