- Correspondence to Dr Elise Whitley, MRC/CSO Social and Public Health Sciences Unit, University of Glasgow, 200 Renfield St, Glasgow G2 3QB, UK;
- Received 6 January 2017
- Revised 9 May 2017
- Accepted 1 June 2017
- Published in print 1 December 2017.
- Published online 15 November 2017.
- Published first 21 August 2017.
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