The following clinicians contributed to this briefing:
Professor Ulrich von Oppell, Consultant Cardiac Surgeon, University Hospital of Wales, Cardiff & Vale University Health board. Honorary Professor of Cardiothoracic Surgery, University of Cardiff.
Professor Gianni Angelini, British Heart Foundation Professor of Cardiac Surgery, Bristol Heart Institute, University of Bristol.
Mr Timothy Locke, Consultant Cardiothoracic Surgeon, Sheffield Teaching Hospitals NHS Foundation Trust.