University of Glasgow - MRC/CSO Social and Public Health Sciences Unit, University of Glasgow - MRC/CSO Social and Public Health Sciences Unit, University of Glasgow - Institute of Health and Wellbeing, King's College London - National Addiction Centre, King's College London - National Addiction Centre, University of Stirling - Institute for Social Marketing and Health, University of Stirling - Institute for Social Marketing and Health, University of Stirling - Institute for Social Marketing and Health, University of Glasgow - MRC/CSO Social and Public Health Sciences Unit, NHS National Services Scotland - Information Services Division, University of Glasgow - MRC/CSO Social and Public Health Sciences Unit, University of Aberdeen - Health Economics Research Unit, Public Health Scotland, University of Glasgow - MRC/CSO Social and Public Health Sciences Unit, Royal Infirmary of Edinburgh, NHS Foundation Trust - Liverpool University Hospitals NHS Foundation Trust (LUH), Government of the United Kingdom - Glasgow Royal Infirmary, University of Hull - Institute for Clinical and Applied Health Research (ICAHR), University of Stirling - Institute for Social Marketing and Health, Government of the United Kingdom - Sheffield Teaching Hospitals, Victoria University - Mitchell Institute and University of Glasgow - MRC/CSO Social and Public Health Sciences Unit