1. South London and Maudsley NHS Trust/King’s College London, London, UK
2. School of Public Health, The University of Queensland, Brisbane, QLD, Australia
3. School of Applied Psychology, Griffith Centre for Mental Health, Griffith University, Mount Gravatt, QLD, Australia
4. Centre for Health Services Research, The University of Queensland, Brisbane, QLD, Australia
5. Centre for Psychological Research, Oxford Brookes University, Oxford, UK
6. Social Equity Research Centre and Digital Ethnography Research Centre, RMIT University, Melbourne, VIC, Australia
7. National Drug and Alcohol Research Centre, UNSW Sydney, Sydney, NSW, Australia
8. Global Drug Survey, London, UK
9. Institute of Epidemiology, University College London, London, UK