- Correspondence to Dr Ian Ayenga Sammy, School of Health and Related Research, The University of Sheffield, 30 Regent Street, Sheffield, South Yorkshire S1 4DA, UK;
- Received 25 May 2016
- Revised 7 December 2016
- Accepted 17 December 2016
- Published in print 1 April 2017.
- Published online 23 March 2017.
- Published first 24 January 2017.
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