1Department of Cardiothoracic and Vascular Surgery, Vascular Surgery Unit, University Hospital of Heraklion, Crete, Greece

2Department of Medical Imaging, Interventional Radiology Unit, University Hospital of Heraklion, Crete, Greece

3Department of Neurology, University Hospital of Heraklion, Crete, Greece

4School of Medicine, University of Crete, Heraklion, Greece

5Department of Neurology, Henry Ford Hospital, Detroit, MI, USA

Nikolaos Kontopodis, Department of Cardiothoracic and Vascular Surgery, Vascular Surgery Unit, University Hospital of Heraklion, PO Box 1352, Heraklion, 711 10, Greece. Emails: [email protected]; [email protected]