[1] Aristotle Univ Thessaloniki, AHEPA Univ Hosp Thessaloniki, Dept Clin Radiol, Thessaloniki 54124, Greece
[2] Hosp Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
[3] Cleveland Clin, Sect Intervent Radiol, Imaging Inst, Main Campus,9500 Euclid Ave, Cleveland, OH 44195 USA
[4] Aristotle Univ Thessaloniki, Ahepa Univ Hosp, Sch Med, Cardiol Dept 1, Thessaloniki 54636, Greece
[5] Aristotle Univ Thessaloniki, Ahepa Univ Hosp, Sch Med, Dept Neurol 2, Thessaloniki 54636, Greece
[6] Natl & Kapodistrian Univ Athens, Attikon Univ Hosp, Sch Med, Dept Neurol 2, Athens 15772, Greece
[7] Ruhr Univ Bochum, Dept Neurol, St Josef Hosp Bochum, D-44801 Bochum, Germany