- Correspondence to Dr John P Corcoran, University of Oxford Respiratory Trials Unit, Churchill Hospital, Oxford OX3 7LE, UK;
- Received 23 August 2016
- Revised 14 March 2017
- Accepted 23 March 2017
- Published online 14 April 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.