- Correspondence to Dr Hoshing Chang, Food and Drug Administration (FDA), Center for Tobacco Products (CTP), 9200 Corporate Boulevard, Rockville, MD 20850, USA;
- Received 4 December 2013
- Revised 4 March 2014
- Accepted 5 March 2014
- Published in print 1 May 2014.
- Published online 14 April 2014.
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