1. Hatter Cardiovascular Institute, Institute of Cardiovascular Science, University College London, United Kingdom (H.B., D.J.H.).
2. Royal Papworth Hospital, Cambridge, United Kingdom (H.B.).
3. Biomedical Imaging Research Institute and Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA (R.D.).
4. Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles (R.D.).
5. Laboratory for Advanced Cardiovascular Imaging, National Heart, Lung, and Blood Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD (A.E.A.).
6. British Heart Foundation Glasgow Cardiovascular Research Center, Institute of Cardiovascular and Medical Sciences, University of Glasgow, United Kingdom (C.B.).
7. National Institute of Health Research University College London Hospitals Biomedical Research Centre, United Kingdom (D.J.H.).
8. Barts Heart Centre, St. Bartholomew’s Hospital, London, United Kingdom (D.J.H.).
9. National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore (D.J.H.).
10. Cardiovascular and Metabolic Disorders Program, Duke–National University of Singapore, Singapore (D.J.H.).