1. Drug Policy Modelling Program, National Drug and Alcohol Research Centre; UNSW Australia; Sydney NSW Australia
2. University of Zurich; Zurich Switzerland
3. Institute for Social Science Research; University of Queensland; St Lucia QLD Australia
4. University College London; London UK
5. Global Drug Survey Ltd; London UK
6. National Drug Research Institute, Faculty of Health Sciences; Curtin University; Perth WA Australia
7. Centre of Population Health; Burnet Institute; Melbourne VIC Australia