1. The Heart Hospital; London UK
2. Institute of Cardiovascular Science; University College London; London UK
3. Department of Cardiovascular; Respiratory; Nephrology and Geriatrics Sciences; La Sapienza; University of Rome; Rome Italy
4. Oxford Centre for Clinical Magnetic Resonance Research; Department of Cardiovascular Medicine; University of Oxford; Oxford UK
5. Department of Statistics; London School of Hygiene and Tropical Medicine; London UK
6. National Heart; Lung and Blood Institute; National Institutes of Health; Bethesda MD USA
7. University Medical Centre Hamburg-Eppendorf; Department of Diagnostic and Interventional Radiology; Hamburg Germany
8. The Whittington Hospital; London UK
9. University College Hospital; London UK