1. Department of Neurology, Columbia University Medical Center, New York, NY, USA
2. Department of Neurology, University of Ioannina School of Medicine, Ioannina, Greece
3. Department of Neurology, Democritus University of Thrace, Alexandroupolis, Greece and St Anne's University Hospital Brno, Brno, Czech Republic
4. International Clinical Research Center, St Anne's University Hospital Brno, Brno, Czech Republic