- Correspondence to Dr Patrick Horner, School of Social and Community Medicine, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK;
- Received 17 February 2016
- Revised 2 June 2016
- Accepted 18 June 2016
- Published in print 1 March 2017.
- Published online 17 February 2017.
- Published first 14 July 2016.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.