RT Journal Article SR Electronic T1 REPLY JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 142 OP 142 DO 10.1136/thx.34.1.142 VO 34 IS 1 A1 Honor M Anthony YR 1979 UL http://thorax.bmj.com/content/34/1/142.abstract AB