1 British Heart Foundation Centre of Research Excellence, School of Cardiovascular and Metabolic Health, University of Glasgow, Glasgow, United Kingdom. Electronic address: john.cleland@glasgow.ac.uk.
2 British Heart Foundation Centre of Research Excellence, School of Cardiovascular and Metabolic Health, University of Glasgow, Glasgow, United Kingdom.
3 Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, United Kingdom.