[1] Aristotle Univ Thessaloniki, AHEPA Univ Hosp, Dept Cardiothorac Surg, Sch Med, GR-54006 Thessaloniki, Greece
[2] Univ Hosp Essen, Dept Thorac & Cardiovasc Surg, West German Heart Ctr, Essen, Germany
[3] Aristotle Univ Thessaloniki, AHEPA Univ Hosp, Surg Dept 3, Sch Med, GR-54006 Thessaloniki, Greece
[4] Aristotle Univ Thessaloniki, AHEPA Univ Hosp, Dept Radiol, Sch Med, GR-54006 Thessaloniki, Greece
[5] Aristotle Univ Thessaloniki, AHEPA Univ Hosp, Dept Anesthesia & Intens Care, Sch Med, GR-54006 Thessaloniki, Greece