- Correspondence to Dr SC Bourke, Department of Respiratory Medicine, North Tyneside General Hospital, Rake Lane, North Shields, Tyne and Wear NE29 8NH, UK;
- Received September 1, 2015
- Revised October 19, 2015
- Accepted November 10, 2015
- First published January 14, 2016.
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- Data supplement 1 - Online supplement
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