- Correspondence to Dr Terry Frank Pechacek, School of Public Health, Tobacco Center of Regulatory Science, Georgia State University, Urban Life Building, Atlanta, Georgia 30303, USA;
- Received 1 March 2017
- Revised 23 October 2017
- Accepted 24 October 2017
- Published in print 25 November 2017.
- Published online 28 November 2017.
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