- Correspondence to Dr Blair N Coleman, Division of Population Health Science, Office of Science, Center for Tobacco Products, US Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20903-1058, USA;
- Received October 3, 2016
- Revised April 18, 2017
- Accepted April 24, 2017
- First published June 17, 2017.
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