Affiliation: | 1. Department of Cardiothoracic Surgery, University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, UK;2. Faculty of Medicine, Imperial College London, London, UK;3. Department of Medical Education, University of London, London, UK;4. Department of Cardiothoracic Surgery, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK;5. Department of General Surgery, Cardiff and Vale University Health Board, Cardiff, UK |