- 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 August 22, 2017
- Revised November 22, 2017
- Accepted November 28, 2017
- First published February 6, 2018.
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