- Correspondence to Dr Patrick Horner, School of Social and Community Medicine, University of Bristol, 39 Whatley Rd, Bristol, UK;
- Received November 5, 2013
- Revised April 24, 2014
- Accepted May 10, 2014
- First published June 6, 2014.
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.