1 Second Department of Neurology, "Attikon" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece; Department of Neurology, University of Tennessee Health Science Center, Memphis, TN, USA.
2 Second Department of Neurology, "Attikon" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece; Department of Neurology, School of Medicine, University of Ioannina, Ioannina, Greece.
3 Second Department of Neurology, "Attikon" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
4 Department of Neurology, University Hospital of Larissa, University of Thessaly, Larissa, Greece.
5 Department of Neurology, Alexandroupolis University Hospital, Democritus University of Thrace, Alexandroupolis, Greece.
6 Second Department of Neurology, "AHEPA" University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece.
7 Department of Neurology, University of Patras Medical School, Patras, Greece.
8 First Department of Neurology, "Eginition" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
9 Second Department of Neurology, "AHEPA" University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece. Electronic address: grigoria@med.auth.gr.