- Correspondence to Dr Claire M Nightingale, Population Health Research Institute, St. George's, University of London, London SW17 0RE, UK;
- Received September 15, 2016
- Revised November 28, 2016
- Accepted January 4, 2017
- First published March 13, 2017.
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.