1. Victorian Poisons Information Centre and Austin Toxicology Service, Austin Hospital and University of Melbourne, Victoria, Australia;
2. School of Clinical Sciences, Monash University, Victoria, Australia;
3. Fresno Medical Center, University of California San Francisco, Fresno, CA, USA;
4. Royal Prince Alfred Hospital and Sydney Medical School, University of Sydney, NSW, Australia;
5. Department of Toxicology and Emergency, John Hopkins Hospital, Baltimore, MD, USA