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.2009.134379 VO 65 IS 2 A1 Wedzicha, Wisia YR 2010 UL http://thorax.bmj.com/content/65/2/i.abstract AB