Affiliation: | 1. UK Centre for Tobacco and Alcohol Studies, Division of Primary Care, University of Nottingham Medical School, Queen's Medical Centre, Nottingham, UK;2. UK Centre for Tobacco and Alcohol Studies, Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK;3. Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick, Coventry, UK |