1. Unit of Quality Improvement, Department of Cardiothoracic Surgery, University of Thessaly, 41110 Biopolis, Greece
2. Department of Surgery and Cancer, Imperial College London, St Mary’s Hospital, London W2 1NY, UK
3. Department of Cardiothoracic Surgery, Oxford University Hospitals, Oxford OX3 9DU, UK
4. Department of Cardiac Surgery, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London W2 1NY, UK
5. Department of Cardiac Surgery, Nottingham University Hospitals NHS Trust, Nottingham NG5 1PB, UK
6. Department of Therapeutics, Faculty of Medicine, National and Kapodistrian University of Athens, 10679 Athens, Greece
7. School of Medicine, European University Cyprus, Nicosia 2404, Cyprus
8. Department of Cardiology, University of Thessaly, Biopolis, 41110 Larissa, Greece