1Clinical Psychopharmacology Unit, University College London, London, UK
2Psychopharmacology and Addiction Research Centre, University of Exeter, Exeter, UK
3Department of Psychiatry, University of Sao Paolo, Ribero, Preto Brazil
4Institute for Social Science Research, University of Queensland, St Lucia, Australia
5Drug Policy Modelling Program, National Drug and Alcohol Research Centre, UNSW, Sydney, NSW Australia
6National Drug Research Institute, Faculty of Health Sciences, Curtin University, Perth, WA Australia
7Behaviours and Health Risks Program, Burnet Institute, Melbourne, VIC Australia
8Global Drug Survey Ltd, London, UK
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