- Correspondence to Dr Martyn D Pickersgill, Centre for Population Health Sciences, University of Edinburgh, Edinburgh EH8 9AG, UK;
- Received August 7, 2013
- Revised October 16, 2013
- Accepted November 15, 2013
- First published December 10, 2013.
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.