- Correspondence to Dr Robert Schwartz, University of Toronto, Dalla Lana School of PublicHealth, Ontario Tobacco Research Unit, 155 College St., Ste 540, Toronto, ON M5T 3M7, Canada;
- Received 22 June 2017
- Revised 17 August 2017
- Accepted 25 August 2017
- Published online 8 September 2017.
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