RT Journal Article SR Electronic T1 AUTHOR'S REPLY JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 78 OP 78 DO 10.1136/thx.45.1.78-a VO 45 IS 1 A1 SP O'Hickey YR 1990 UL http://thorax.bmj.com/content/45/1/78.2.abstract AB