1. a Queensland Alcohol and Drug Research and Education Centre, School of Population Health, The University of Queensland , Herston , QLD , Australia
2. b Drug Harm Reduction Branch , Preventative Health Directorate, Queensland Health, Division of the Chief Health Officer , Herston , QLD , Australia
3. c School of Social Science, The University of Queensland , St Lucia , QLD , Australia
4. d Crime and Misconduct Commission, St Pauls Terrace , Fortitude Valley , QLD , Australia