1. Department of Emergency Medicine & Clinical Toxicology, Prince of Wales Hospital, Sydney, Australia;
2. Faculty of Medicine, University of New South Wales, Sydney, Australia;
3. Department of Emergency Medicine &Clinical Toxicology Unit, Princess Alexandra Hospital, Brisbane, Australia;
4. Department of Emergency Medicine, Sutherland Hospital, Sydney, Australia;
5. NSW Health Pathology, Prince of Wales Hospital, Sydney, Australia;
6. Department of Clinical Pharmacology, University of Sydney, Sydney, Australia