RT Journal Article SR Electronic T1 Airwaves JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 371 OP 371 DO 10.1136/thorax.58.5.371-a VO 58 IS 5 A1 Wisia Wedzicha YR 2003 UL http://thorax.bmj.com/content/58/5/371.2.abstract AB