1. Department of D/I Radiology, Patras General Hospital, Patras, Greece
2. Department of Medicine, Jacobi Medical Center, Albert Einstein College of Medicine, Bronx, New York Ciry, NY, USA
3. First Department of Radiology, School of Medicine, National & Kapodistrian University of Athens, Areteion Hospital, Athens, Greece
4. Department of Diagnostic and Interventional Neuroradiology, Hospital Bremen-Mitte/Bremen-Ost, Bremen, Germany
5. Division of Vascular Surgery, Laiko General Hospital/University of Athens School of Medicine, Athens, Greece
6. Section of Cardiovascular Medicine, Yale University School of Medicine, New Haven, CT, USA