- Correspondence to Dr Claire Charlotte McKechnie, Glasgow Centre for Population Health, House 6, 1st Floor, 94 Elmbank Street, Glasgow, G2 4NE, UK;
- Received 27 October 2013
- Revised 3 May 2014
- Accepted 7 May 2014
- Published in print 1 December 2014.
- Published online 18 November 2014.
- Published first 28 May 2014.
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