- Correspondence to Dr Martyn Pickersgill, Usher Institute for Population Health Sciences and Informatics, Edinburgh Medical School, University of Edinburgh, Teviot Place, Edinburgh EH8 9AG, UK;
- Accepted 13 July 2015
- Published in print 1 December 2015.
- Published online 24 November 2015.
- Published first 10 August 2015.
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