1. From the School of Physiology, Pharmacology, and Neuroscience, University of Bristol, Bristol, United Kingdom (C.H.F.); Department of Cardiovascular Medicine, Whittington Hospital, London, United Kingdom (R.P.G.); Department of Cardiology, Ashford and St Peter’s NHS Foundation Trust, Chertsey, United Kingdom (P.S.D.); Department of Biochemistry and Physiology, University of Surrey, Surrey, United Kingdom (R.I.J.); and Myocardial Function Section, Imperial College London, London, United Kingdom (E.D....