1. Royal Brompton Hospital, London, United Kingdom (A.G., S.R., B.P.H., N.A.I., K.M., J.K., C.S., P.R.K., J.G.F.C., M.R.C., R.G.A., D.J.P., S.K.P.)
2. Edinburgh Heart Centre, United Kingdom (A.G.J., N.S.)
3. Department of Cardiology, Barts and London NHS Trust, London, United Kingdom (D.A.J., A.M.)
4. Department of Medical Statistics, London School of Hygiene and Tropical Medicine, United Kingdom (S.N.)
5. Barts Heart Centre, St. Bartholomew’s Hospital University College Hospitals London Institute of Cardiovascular Science UCL and The William Harvey Research Institute, Queen Mary University of London (G.L.)
6. National Heart and Lung Institute, Imperial College, London, United Kingdom (M.R.C., D.J.P., S.K.P.)
7. School of Biomedical Engineering and Imaging Sciences, King’s College London, United Kingdom (T.F.I.).