RT Journal Article SR Electronic T1 AUTHORS' REPLY JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1283 OP 1283 DO 10.1136/thx.51.12.1283-a VO 51 IS 12 A1 Somnath Mukhopadhyay A1 Richard E Olver YR 1996 UL http://thorax.bmj.com/content/51/12/1283.3.abstract AB