1. Department of Cardiovascular Medicine, John Radcliffe Hospital, Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford , Oxford OX3 9DU , United Kingdom
2. Oxford Heart Centre, John Radcliffe Hospital , Oxford OX3 9DU , United Kingdom
3. Department of Physiology, Anatomy and Genetics, University of Oxford , Oxford OX1 3PT , United Kingdom
4. Department of Cardiovascular Medicine, Heart and Lung Research Institute , Papworth Road , Cambridge CB2 0AY, United Kingdom
5. Cardiology Department, Buckinghamshire Healthcare NHS Trust, Wycombe Hospital , Queen Alexandra Road , High Wycombe HP11 2TT, United Kingdom
6. Heart Transplant Department, Harefield Hospital, Royal Brompton and Harefield Hospitals , Hill End Road , Harefield UB9 6JH, United Kingdom
7. Clinical Physiology, Department of Clinical Sciences Lund, Lund University, Skåne University Hospital , Lund , Sweden