- Correspondence to Dr Alexander B Barker, Division of Epidemiology and Public Health, UK Centre for Tobacco and Alcohol Studies, Clinical Sciences Building, City Hospital, University of Nottingham, Nottingham NG7 2RD, UK;
- Received February 22, 2019
- Revised April 16, 2019
- Accepted April 26, 2019
- First published May 30, 2019.
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