School of Medicine (J.W.B., R.J.F., S.C.L., A.R., J.R.L., G.F.W., C.J.S.), University of Western Australia, Perth. Department of Cardiology (J.W.B., S.C.L., A.R., C.J.S.), Department of Cardiology, Royal Perth Hospital, Perth, Western Australia. Department of Nuclear Medicine, Sir Charles Gairdner Hospital, Nedlands, Western Australia (R.J.F.). Harry Perkins Institute for Medical Research (M.P.), University of Western Australia, Perth. Centre for Medical Research (M.P.), University of Western Australia, Perth. School of Medical and Health Sciences, Edith Cowan University, Perth, Australia (J.R.L.). Centre for Kidney Research, Children's Hospital at Westmead, School of Public Health, Sydney Medical School, The University of Sydney, NSW, Australia (J.R.L.). Cardiometabolic Service (G.F.W.), Department of Cardiology, Royal Perth Hospital, Perth, Western Australia.