RT Journal Article SR Electronic T1 Introduction JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 585 OP 586 DO 10.1136/thorax.55.7.585 VO 55 IS 7 A2 P D Sly A2 S Stick A1 Peter D Sly YR 2000 UL http://thorax.bmj.com/content/55/7/585.abstract AB