1. Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Greece
2. B' Neurological Department, Aristotle University of Thessaloniki, AHEPA General Hospital, Thessaloniki, Greece
3. Department of Neurology, Multiple Sclerosis Unit, Papageorgiou General Hospital, Thessaloniki, Greece
4. Laboratory of Neurogenetics, Department of Neurology, University of Thessaly, University Hospital of Larissa, Larissa, Greece