1. From the Division of Cardiovascular Medicine, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Headley Way, United Kingdom (D.L., A.B., D.V., M.A., G.L.D.M., G.F., S.D., R.W., J.F., V.F., S.P., M.D.R., R.C., S.N., E.D.A.); Department of Cardiovascular Medicine, Oxford Heart Centre, John Radcliffe Hospital, Headley Way, United Kingdom (A.B., K.C., R.K.); and Department of Radiology, Brigham and Women’s Hospital, Boston, MA (M.J.-H.).