- Correspondence to Dr Ingrid Young, MRC/CSO Social and Public Health Sciences Unit, University of Glasgow, 200 Renfield Street, Glasgow G2 3QB, UK;
- Received 2 June 2014
- Revised 13 October 2014
- Accepted 8 November 2014
- Published in print 4 December 2014.
- Published online 7 December 2014.
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