[1] Calvary Mater Newcastle, Dept Clin Toxicol & Pharmacol, Newcastle, NSW, Australia
[2] Univ Newcastle, Sch Med Practice, Callaghan, NSW 2308, Australia
[3] Charles Darwin Univ, Menzies Sch Hlth Res, Darwin, NT 0909, Australia
[4] Womens & Childrens Hosp, Dept Toxinol, Adelaide, SA, Australia
[5] Western Australian Inst Med Res, Ctr Clin Res Emergency Med, Perth, WA, Australia
[6] Univ Western Australia, Perth, WA 6009, Australia