1. Discipline of Addiction Medicine, National Health and Medical Research Council Centre for Excellence in Mental Health and Substance Use, University of Sydney, NSW, Australia
2. Drug Health Services, Royal Prince Alfred Hospital, Level 6 King George V Building, Camperdown, NSW, Australia
3. Faculty of Health Sciences, National Health and Medical Research Council, Centre for Excellence in Mental Health and Substance Use, University of Sydney, NSW, Australia
4. Pain Management Research Institute, University of Sydney, Royal North Shore Hospital, Douglas Building, St Leonards, NSW, Australia
5. The Sydney ACT Centre, 44 Bridge St, Sydney, NSW, Australia