1. Department of Neurology, University Hospital of Larissa, Faculty of Medicine, University of Thessaly, Larissa, Greece
2. School of Medicine, University of Thessaly, Larissa, Greece
3. Department of Ophthalmology, General Hospital of Trikala, Trikala, Greece
4. Department of Speech and Language Therapy, University of Ioannina, Ioannina, Greece
5. Multiple Sclerosis Center, B’ Department of Neurology, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
6. Department of Rheumatology and clinical Immunology, University Hospital of Larissa, Faculty of Medicine, University of Thessaly, Larissa, Greece