1 Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens 15344, Greece; Department of Neurology, University of Tennessee Health Science Center, Memphis, Tennessee, USA. Electronic address: tsivgoulisgiorg@yahoo.gr.
2 Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens 15344, Greece.