Louise Cullen1, William Parsonage2, Martin Than3. 1. Department of Emergency Medicine, Royal Brisbane and Women's Hospital, Herston, Brisbane, QLD 4029, Australia. Electronic address: louise.cullen@health.qld.gov.au. 2. Department of Cardiology, Royal Brisbane and Women's Hospital, Herston, Brisbane, QLD 4029, Australia. 3. Emergency Department, Christchurch Hospital, Christchurch, New Zealand.