Affiliations

• ¹ Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK. Electronic address: ailsa.butler@phc.ox.ac.uk.
• ² Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK.
• ³ Wolfson Institute of Preventive Medicine, Barts, The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
• ⁴ National Drug and Alcohol Research Centre, University of New South Wales, Sydney, Australia.
• ⁵ National Institute for Health Innovation, University of Auckland, Auckland, New Zealand.
• ⁶ Norwich Medical School, University of East Anglia, Norwich, UK.
• ⁷ Tobacco Research and Treatment Center, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.