1. Division of Imaging Science and Biomedical Engineering, King's College London, London, United Kingdom;
2. British Heart Foundation, Centre of Excellence, King's College London, London, United Kingdom; and
3. Department of Radiology, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile;
4. Division of Cardiovascular, King's College London, London, United Kingdom;
5. Wellcome Trust and Engineering and Physical Sciences Research Council Medical Engineering Center, King's College London, London, United Kingdom