- 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 June 22, 2017
- Revised August 17, 2017
- Accepted August 25, 2017
- First published September 8, 2017.
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