- Correspondence to Dr Jon M Dickson, The Academic Unit of Primary Medical Care, The University of Sheffield, Samuel Fox House, Northern General Hospital, Herries Road, Sheffield S5 7AU, UK;
- Received 17 January 2017
- Revised 19 June 2017
- Accepted 11 July 2017
- Published in print 17 August 2017.
- Published online 19 August 2017.
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