- Correspondence to Dr Kate Brain, Division of Population Medicine, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4YS, UK;
- Received November 4, 2016
- Revised February 7, 2017
- Accepted February 27, 2017
- First published July 14, 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.