1. Department of Cardiology, Liverpool Hospital, Liverpool, NSW, Australia
2. School of Medicine, Western Sydney University, Penrith, NSW, Australia
3. South-West Clinical School, University of New South Wales, Kensington, NSW, Australia
4. Department of Cardiology, Campbelltown Hospital, Campbelltown, NSW, Australia
5. Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia