- Correspondence to Dr Claire M Nightingale, Population Health Research Institute, St. George's, University of London, London SW17 0RE, UK;
- Received 15 September 2016
- Revised 28 November 2016
- Accepted 4 January 2017
- Published in print 1 July 2017.
- Published online 21 June 2017.
- Published first 13 March 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.