- Correspondence to Dr Yue Huang, UK Centre for Tobacco Control Studies, Division of Epidemiology and Public Health, University of Nottingham, Clinical Sciences Building, City Hospital, Nottingham NG5 1PB, UK;
- Received 1 July 2011
- Accepted 3 December 2011
- Published in print 1 July 2013.
- Published online 11 June 2013.
- Published first 13 January 2012.
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