1. Cardiology Clinical Academic Group, St George’s, University of London, United Kingdom (G.F., J.W., R.B., E.B., M.P., S.S., M.N.S.).
2. Cardiothoracic Centre, Guy’s and St Thomas’ Hospital, London, United Kingdom (G.F.).
3. King’s College London, United Kingdom (G.F.).
4. Cardiovascular Research Centre, Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom (G.F.).
5. Division of Cardiovascular Science, University of Manchester, Manchester University NHS Foundation Trust, United Kingdom (A.M.).