[1] Gen Univ Hosp Patras, Dept Internal Med, Patras, Greece
[2] Gen Univ Hosp Patras, Dept Surg, Patras, Greece
[3] Gen Univ Hosp Patras, Dept Cardiothorac Surg, Patras, Greece
[4] Elpis Gen Hosp, Dept Cardiol, Athens, Greece
[5] Univ Aegean, Dept Cultural Technol & Commun, Intelligent Syst Lab, Mitilini, Greece