- Correspondence to Dr Hayden McRobbie, Tobacco Dependence Research Unit, 55 Philpot Street, London, E1 2JH, UK;
- Received 22 November 2012
- Revised 22 November 2012
- Accepted 16 January 2013
- Published in print 1 February 2013.
- Published online 12 February 2013.
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