RT Journal Article SR Electronic T1 Recent Advances in Respiratory Medicine 5 JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 460 OP 460 DO 10.1136/thx.47.6.460-a VO 47 IS 6 A1 MW YR 1992 UL http://thorax.bmj.com/content/47/6/460.2.abstract AB