- Correspondence to Dr Maria Fleischmann, Department of Epidemiology and Public Health, University College London, London WC1E 6BT, UK;
- Received 27 March 2017
- Revised 11 August 2017
- Accepted 28 September 2017
- Published online 17 October 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.