- Correspondence to Dr Debra A Howell, Epidemiology & Cancer Statistics Group, Seebohm Rowntree Building, University of York, YO10 5DD, York, UK;
- Received 1 December 2016
- Revision received 7 April 2017
- Accepted 20 May 2017
- Published in print 20 July 2017.
- Published online 19 July 2017.
- Published first 29 June 2017.
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