- Correspondence to Professor Graham P Martin, Department of Health Sciences, University of Leicester, 22–28 Princess Road West, Leicester LE1 6TP, UK;
- Received 2 July 2014
- Accepted 3 July 2014
- Published in print 1 September 2014.
- Published online 12 August 2014.
- Published first 18 July 2014.
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