RT Journal Article SR Electronic T1 Airwaves JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP i OP i DO 10.1136/thx.2009.126532 VO 64 IS 10 A2 Wedzicha, Wisia YR 2009 UL http://thorax.bmj.com/content/64/10/i.abstract AB