1 School of Medicine and Public Health, University of Newcastle and Department of Clinical Toxicology, Calvary Mater Newcastle, New South Wales, Australia.
2 New South Wales Poisons Information Centre, Sydney Children's Hospital Network, New South Wales, Australia; Clinical Pharmacology, Sydney Medical School, University of Sydney, New South Wales, Australia.
3 Centre for Clinical Research in Emergency Medicine, Royal Perth Hospital, Harry Perkins Institute of Medical Research and the University of Western Australia, Perth, Australia.