- Correspondence to Jo Cranwell, Division of Epidemiology and Public Health, UK Centre for Tobacco and Alcohol Studies, University of Nottingham, Clinical Sciences Building, City Hospital, Nottingham NG5 1PB, UK;
- Received July 22, 2015
- Revised November 12, 2015
- Accepted November 17, 2015
- First published January 14, 2016.
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