1. Department of Cardiology, Liverpool Hospital, Sydney, Elizabeth Street, Locked Bag 7103T, Liverpool BC, New South Wales 1871, Australia
2. Faculty of Medicine, The University of New South Wales, Sydney, New South Wales, Australia
3. Faculty of Nursing, Western Sydney University, Sydney, New South Wales, Australia
4. Ingham Institute for Applied Medical Research, Sydney, New South Wales, Australia
5. Department of Emergency Medicine, Liverpool Hospital, Sydney, New South Wales, Australia
6. College of Medicine and Public Health, Flinders University of South Australia, Adelaide, South Australia, Australia