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.2003.awjan VO 59 IS 1 A1 Wedzicha, Wisia YR 2004 UL http://thorax.bmj.com/content/59/1/1.2.abstract AB