- Correspondence to Dr Shannon M Farley, New York City Department of Health and Mental Hygiene, Bureau of Chronic Disease Prevention and Tobacco Control, 42–09 28th St, 11th Flr., CN-46, Queens, NY 11101-4132, USA;
- Received April 20, 2015
- Accepted January 27, 2016
- First published February 12, 2016.
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