- Correspondence to Professor Laurence Gruer, Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, Teviot Place, Edinburgh EH8 9AG, UK;
- Received 24 February 2016
- Revised 30 May 2016
- Accepted 4 July 2016
- Published in print 1 December 2016.
- Published online 10 November 2016.
- Published first 29 July 2016.
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