1 Cardiovascular Magnetic Resonance Unit, Royal Brompton and Harefield Hospitals, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom. (I.L., G.B., J.W., C.B.-D.).
2 Department of Experimental and Clinical Medicine, Magna Graecia University, Catanzaro, Italy (I.L.).
3 Department of Cardiology, Royal Brompton and Harefield Hospitals, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom. (F.R.-G.).
4 National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD (P.K.).
5 School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and Medicine, King's College University, London, United Kingdom (C.B.-D.).