- Correspondence to Dr Joanna E Cohen, Institute for Global Tobacco Control, Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, 2213 McElderry St, Fourth Floor Baltimore, MD 21205, USA;
- Received 23 August 2016
- Revised 16 January 2017
- Accepted 17 February 2017
- Published online 17 April 2017.
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