1. Clinical and Experimental Toxicology Unit, Department of Emergency Medicine; Prince of Wales Hospital; Randwick NSW Australia
2. Department of Pharmacology, School of Medical Sciences; University of Sydney; Sydney NSW Australia
3. School of Medicine and Public Health; University of Newcastle; Newcastle NSW Australia
4. Department of Clinical Toxicology; Calvary Mater Newcastle Hospital; Newcastle NSW Australia
5. School of Pharmacy; University of Otago; Dunedin New Zealand