1. Department of Sociology and Social Work, Aalborg University , Fibigerstræde 13, 9220 Aalborg Ø , Denmark
2. Centre for Health Services Research, Faculty of Medicine, University of Queensland , Woolloongabba, Queensland , Australia
3. Institute of Epidemiology and Health Care, University College London , London , UK
4. Global Drug Survey , London , UK
5. Department of Clinical Pharmacy, University of California , San Francisco , USA
6. Social and Global Studies Centre and Digital Ethnography Research Centre, RMIT University , Melbourne, Victoria , Australia , NSW , Australia
7. National Drug and Alcohol Research Centre, UNSW Sydney , Melbourne, Victoria , Australia , NSW , Australia