1. Department of General Surgery, London North West University Healthcare NHS Trust, London, UK
2. Department of Academic Medicine, St. George’s University Hospital, London, UK
3. Department of Academic Medicine, Kettering General Hospital NHS Foundation Trust, Kettering, UK
4. Department of Cardiothoracic Surgery, University Hospital Catania, Catania, Italy
5. Department of Cardiothoracic Surgery, James Cook University Hospital, Middlesbrough, UK