RT Journal Article SR Electronic T1 Airwaves JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1 OP 1 DO 10.1136/thx.2011.160697 VO 66 IS 3 A1 Bush, Andrew A1 Pavord, Ian YR 2011 UL http://thorax.bmj.com/content/66/3/1.abstract AB