RT Journal Article SR Electronic T1 Commentary JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 100 OP 100 DO 10.1136/thx.50.1.100 VO 50 IS 1 A1 JMB Hughes YR 1995 UL http://thorax.bmj.com/content/50/1/100.abstract AB