RT Journal Article SR Electronic T1 Airwaves JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 647 OP 647 DO 10.1136/thorax.58.8.647-a VO 58 IS 8 A1 Wisia Wedzicha YR 2003 UL http://thorax.bmj.com/content/58/8/647.2.abstract AB