RT Journal Article SR Electronic T1 Poorly perceived asthma. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 408 OP 409 DO 10.1136/thx.47.6.408 VO 47 IS 6 A1 P J Barnes YR 1992 UL http://thorax.bmj.com/content/47/6/408.abstract AB