1. 1Department of Cardiology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
2. 2Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
3. 3Department for Health, University of Bath, Bath, UK
4. 4Department of Cardiology, North West Anglia NHS Foundation Trust, Peterborough, Cambridgeshire, UK
5. 5Research Institute for Sports and Exercise Physiology, Liverpool John Moores University, Liverpool, Merseyside, UK
6. 6North West Heart Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
7. 7Department of Cardiology, Colchester Hospital NHS Trust, Colchester, UK
8. 8Department of Cardiology, Papworth Hospital, Papworth Everard, Cambridge, UK