University of Nottingham, Faculty of Medicine and Health Sciences, Nottingham City Hospital, UK Centre for Tobacco and Alcohol Studies, University of Nottingham, Cardiff University, University of Nottingham, University of Nottingham, The University of Manchester - Manchester University NHS Foundation Trust, University of Nottingham, Cardiff University, University of York, Queen Mary University of London, University of Nottingham, University of York, Leeds Teaching Hospitals NHS Trust, University of Leeds, University of Leeds, Queen Mary University of London, University of Leeds, University of Leeds, University of Exeter, University of Nottingham, Leeds Teaching Hospitals NHS Trust, Cardiff University, University of Leeds and University of Leeds