1. 2nd Department of Cardiology, University Hospital of Ioannina, University of Ioannina, Ioannina, Greece.
2. 2nd Department of Neurology, ATTIKON University Hospital, National and Kapodistrian University of Athens, Athens, Greece.
3. Department of Neurology, University Hospital of Ioannina, University of Ioannina, Ioannina, Greece.
4. 2nd Department of Neurology, Faculty of Health Sciences, School of Medicine, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece.