- Correspondence to Dr Stuart Oultram, Department of Health Services Research, Institute of Psychology, Health, and Society, University of Liverpool, The Waterhouse Building, Brownlow Street, Liverpool L69 3GL, UK;
- Accepted 18 March 2013
- Published in print 1 December 2013.
- Published online 20 November 2013.
- Published first 12 April 2013.
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