1. Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
2. Division of Psychiatry, University College London, London, UK
3. Camden and Islington NHS Foundation Trust, London, UK
4. Queensland Digital Health Centre, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
5. School of Public Health, Faculty of Medicine, The University of Queensland, Hesrtone, Queensland, Australia
6. UCL Medical School, Faculty of Medical Sciences, London, UK
7. Centre for Health Services Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
8. Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
9. National Addiction Centre, King’s College London, London, UK
10. Institute of Epidemiology and Health Care, University College London, London, UK