1. Emergency Medicine, Royal Perth Hospital University of Western Australia Perth Western Australia Australia
2. Centre for Clinical Research in Emergency Medicine Harry Perkins Institute of Medical Research Perth Western Australia Australia
3. Peer Based Harm Reduction WA Perth Western Australia Australia
4. Alcohol and Drug Service St Vincent's Hospital Sydney Sydney New South Wales Australia
5. The National Centre for Clinical Research on Emerging Drugs, c/o The National Drug and Alcohol Research Centre, UNSW Sydney Sydney New South Wales Australia