RT Journal Article SR Electronic T1 Commentary JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1323 OP 1323 DO 10.1136/thx.50.12.1323 VO 50 IS 12 A1 D M Geddes YR 1995 UL http://thorax.bmj.com/content/50/12/1323.abstract AB