- Correspondence to Dr Carri Westgarth, Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Cheshire, CH647TE, UK;
- Received April 12, 2017
- Revised December 12, 2017
- Accepted December 14, 2017
- First published February 1, 2018.
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.