- Correspondence to Dionysis Spanopoulos, Division of Epidemiology and Public Health, UK Centre for Tobacco Control Studies, Nottingham City Hospital, Clinical Sciences Building, Nottingham NG5 1PB, UK;
- Received September 5, 2012
- Revised January 3, 2013
- Accepted January 30, 2013
- First published February 28, 2013.
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