[1] Univ Western Australia, Med Sch, Perth, WA, Australia
[2] Harry Perkins Inst Med Res, Dept Adv Clin & Translat Cardiovasc Imaging, Perth, WA, Australia
[3] Fiona Stanley Hosp, Emergency Dept, Perth, WA, Australia
[4] Armadale Hlth Serv, Emergency Dept, Perth, WA, Australia
[5] Fiona Stanley Hosp, Dept Cardiol, Perth, WA, Australia