- Correspondence to Dr Frances A Stillman, Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Institute for Global Tobacco, 2213 McElderry Street, 4th Floor, Baltimore, MD 21205, USA;
- Accepted 29 May 2014
- Published in print 1 July 2015.
- Published online 22 June 2015.
- Published first 20 June 2014.
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