RT Journal Article SR Electronic T1 AUTHOR'S REPLY JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 320 OP 320 DO 10.1136/thx.50.3.320-a VO 50 IS 3 A1 H Magnussen YR 1995 UL http://thorax.bmj.com/content/50/3/320.2.abstract AB