- Correspondence to Dr B Barr, Department of Public Health and Policy, Institute of Psychology, Health and Society, University of Liverpool, Whelan Building, Liverpool L69 3GB, UK;
- Received 16 June 2015
- Revised 28 August 2015
- Accepted 5 October 2015
- Published online 9 March 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.