1 Second Department of Neurology, School of Medicine, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece.
2 Fourth Department of Internal Medicine, School of Medicine, ''Attikon'' University Hospital, National and Kapodistrian University of Athens, Athens, Greece.
3 Second Department of Neurology, School of Medicine, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece. tsivgoulisgiorg@yahoo.gr.