- Correspondence to Ruth Bell, Institute of Health & Society, Newcastle University, Baddiley-Clark Building, Richardson Road, Newcastle upon Tyne, NE2 4AX, UK;
- Received 10 October 2016
- Revised 14 December 2016
- Accepted 4 January 2017
- Published in print 1 January 2018.
- Published online 18 December 2017.
- Published first 15 February 2017.
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