1 Second Department of Neurology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece. dtzanetakos@med.uoa.gr.
2 Second Department of Neurology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece.
3 Research Unit of Radiology, Second Department of Radiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
4 Department of Neurology, University of Tennessee Health Science Center, Memphis, TN, USA.