- Correspondence to Dr Allison C Hoffman, Center for Tobacco Products, Bldg 75, Rm 5426, 10903 New Hampshire Ave, Silver Spring, MD 20993-0002, USA;
- Received May 24, 2016
- Revised August 2, 2016
- Accepted August 4, 2016
- First published September 15, 2016.
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