- Correspondence to Susan F Rudy, Office of Science/Division of Individual Health Science/Medical Branch, USA Food & Drug Administration/Center for Tobacco Products, Bldg. 75/Rm. 5464W, 10903 New Hampshire Ave., Silver Spring, MD 20993-0002, USA;
- Received August 3, 2015
- Accepted February 10, 2016
- First published March 9, 2016.
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