From the Centre for Heart Research, Westmead Institute for Medical Research, 176 Hawkesbury Rd, Westmead, Sydney, NSW 2145, Australia (T.D., D.S., S.T., J.J.H.C.); Department of Cardiology, Westmead Hospital, Westmead, Australia (T.D., D.S., S.T., O.A., L.T., J.J.H.C.); Sydney School of Health Sciences, Faculty of Medicine and Health, University of Sydney, Sydney, Australia (T.D., D.S., S.T., L.T., J.J.H.C.); Cardiovascular Discovery Group, Kolling Institute, University of Sydney and Royal North Shore Hospital, St Leonards, Sydney, Australia (G.A.F.); Department of Cardiology, St Vincent's Hospital, Darlinghurst, Australia (M.F.); Cardiac Mechanics Laboratory, Victor Chang Cardiac Research Institute, Darlinghurst, Australia (M.F.); Imaging and Phenotyping Laboratory, Faculty of Medicine and Health, Charles Perkins Centre, University of Sydney, Sydney, Australia (S.M.G.); Department of Radiology, Royal Prince Alfred Hospital, Camperdown, Australia (S.M.G.); Nepean Clinical School of Medicine, Charles Perkin Centre Nepean, University of Sydney, Kingswood, Australia (F.P.); and Department of Cardiology, Nepean Hospital, Kingswood, Australia (F.P.).