1. 1st Department of Cardiac Surgery, Henry Dunant Hospital Center, Athens, Greece
2. Department of Cardiothoracic and Vascular Surgery, Westpfalz-Klinikum, Kaiserslautern, Germany
3. Department of Anesthesiology, Henry Dunant Hospital Center, Athens, Greece
4. Department of Cardiothoracic Surgery, General University Hospital of Patras, Patras, Greece
5. Department of Thoracic Surgery, Medical Center – University of Freiburg, Freiburg, Germany