1 Second Department of Neurology, "Attikon" University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
2 Division of Neurology, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden.
3 Second Department of Neurology, "Attikon" University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. tsivgoulisgiorg@yahoo.gr.
4 Department of Neurology, University of Tennessee Health Science Center, Memphis, USA. tsivgoulisgiorg@yahoo.gr.