- Correspondence to Dr Alison Parkes, MRC/CSO Social and Public Health Sciences Unit, University of Glasgow, 4 Lilybank Gardens, Glasgow G12 8RZ, UK;
- Received 7 December 2011
- Revised 15 October 2012
- Accepted 7 December 2012
- Published in print 1 February 2013.
- Published online 25 March 2013.
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