1. From the Department of Cardiology, Oxford University Hospitals NHS Trust, Oxford, United Kingdom (K.C.K.W., M.J., N.Q., C.R.H., M.R.G., K.R., Y.B., T.R.B.); Department of Cardiology, Royal Bournemouth and Christchurch Hospitals NHS Trust, Dorset, United Kingdom (J.R.P., M.S., R.B.); and Department of Cardiology, Changi General Hospital, Singapore, Singapore (K.C.K.W.).