RT Journal Article SR Electronic T1 AUTHORS' REPLY JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1050 OP 1050 DO 10.1136/thx.48.10.1050-a VO 48 IS 10 A1 M G Pearson A1 M R Partridge A1 B D W Harrison YR 1993 UL http://thorax.bmj.com/content/48/10/1050.2.abstract AB