- Correspondence to Professor T M Marteau, Behaviour and Health Research Unit, University of Cambridge, Forvie Site, Addenbrooke's Hospital, Cambridge CB2 0SR, UK;
- Received 16 January 2016
- Revised 19 June 2016
- Accepted 8 July 2016
- Published in print 1 July 2017.
- Published online 29 June 2017.
- Published first 5 September 2016.
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