RT Journal Article SR Electronic T1 Corrections JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 543 OP 543 DO 10.1136/thx.2003.008912corr1 VO 59 IS 6 YR 2004 UL http://thorax.bmj.com/content/59/6/543.2.abstract AB