RT Journal Article SR Electronic T1 Reply JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 663 OP 664 DO 10.1136/thx.43.8.663-b VO 43 IS 8 A1 Miller, M R A1 Pincock, A C YR 1988 UL http://thorax.bmj.com/content/43/8/663.3.abstract AB