- Correspondence to Corresponding author Dr Nicholas S Hopkinson, NIHR Respiratory Biomedical Research Unit, Royal Brompton and Harefield NHS Foundation Trust and Imperial College, The Royal Brompton Hospital, Fulham Road, London SW3 6NP, UK;
- Published in print 1 April 2017.
- Published online 17 March 2017.
- Published first 19 January 2017.
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