1. Northern Sydney Local Health District Drug and Alcohol Services, , St Leonards, New South Wales , Australia
2. The University of Sydney Sydney Medical School, Faculty of Medicine and Health, , Sydney, New South Wales , Australia
3. St Vincent’s Hospital Department of Clinical Pharmacology and Toxicology, , Sydney, New South Wales , Australia
4. University of New South Wales School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, Faculty of Medicine and Health, , Sydney, New South Wales , Australia
5. Western Sydney Local Health District Drug Health Services, , Wentworthville, New South Wales , Australia