- Correspondence to Dr Pamela M Ling, Division of General Internal Medicine, Department of Medicine, Center for Tobacco Control Research and Education, University of California San Francisco, 530 Parnassus, Ste 366, San Francisco, CA 94143-1390, USA;
- Received March 30, 2016
- Accepted July 12, 2016
- First published October 3, 2016.
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