[1] Onassis Cardiac Surg Ctr, Intervent Cardiol, 356 Syngrou Ave, Athens 17674, Greece
[2] Onassis Cardiac Surg Ctr, Intens Care Unit, Athens, Greece
[3] Univ Athens, Sch Med, Dept Hyg Epidemiol & Med Stat, Athens, Greece
[4] Natl & Kapodistrian Univ Athens, Med Sch, Athens, Greece
[5] Attikon Univ Hosp, Dept Cardiol, Athens, Greece
[6] Onassis Cardiac Surg Ctr, Intervent Cardiol, Athens, Greece