Joanne Cobbett1,2, Emma Carlin3, Jessica Forbes4. 1. Emergency Department, Southern District Health Board, Invercargill, New Zealand. 2. Dunedin School of Medicine, University of Otago, Dunedin, New Zealand. 3. Emergency Department, Capital and Coast District Health Board, Wellington, New Zealand. 4. Emergency Department, The Townsville Hospital, Townsville, Queensland, Australia.