- Correspondence to Professor Theresa M Marteau, Behaviour and Health Research Unit, University of Cambridge, Forvie Site, Addenbrooke's Hospital, Cambridge CB2 0SR, UK;
- Received 14 July 2015
- Revised 25 November 2015
- Accepted 12 December 2015
- Published in print 18 January 2016.
- Published online 17 January 2016.
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