[1] Univ Western Australia, Sch Med, 35 Stirling Highway, Crawley, WA 6009, Australia
[2] Royal Perth Hosp, Dept Cardiol, Victoria Sq, Perth, WA 6000, Australia
[3] Univ Western Australia, Sch Populat & Global Hlth, Crawley, WA 6009, Australia
[4] Fiona Stanley Hosp, Dept Cardiol, 11 Robin Warren Dr, Murdoch, WA 6150, Australia
[5] Natl Echo Database Australia NEDA, 50 Colin St, Perth, WA 6005, Australia
[6] Fiona Stanley Hosp, Harry Perkins Inst Med Res, 11 Robin Warren Dr, Perth, WA 6150, Australia