- Correspondence to Dr Annette R Kaufman, Tobacco Control Research Branch, Behavioral Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD 20850, USA;
- Received 22 August 2017
- Revised 22 November 2017
- Accepted 28 November 2017
- Published online 6 February 2018.
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