1. Cardiothoracic Surgery DepartmentGeneral Hospital of Athens “Evangelismos”Athens Greece
2. Cardiothoracic Surgery Department, School of MedicineUniversity Hospital of Ioannina Greece
3. Department of PathologyGeneral Hospital of Athens “Evangelismos”Athens Greece
4. Department of Cardiology, School of MedicineUniversity Hospital of Ioannina Greece
5. Department of Anesthesiology, School of MedicineUniversity Hospital of Ioannina Greece