RT Journal Article SR Electronic T1 INTRODUCTION JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP ii1 OP ii1 DO 10.1136/thorax.57.suppl_2.ii1 VO 57 IS suppl 2 A1 D M Mitchell A1 S O Shaheen A1 A A Woodcock YR 2002 UL http://thorax.bmj.com/content/57/suppl_2/ii1.abstract AB