- 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 in print 1 September 2017.
- Published online 21 August 2017.
- Published first 14 April 2017.
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