- Correspondence to James F Pankow, 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 November 24, 2016
- Revised February 6, 2017
- Accepted February 15, 2017
- First published April 11, 2017.
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