RT Journal Article SR Electronic T1 Asthma and the psyche JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 511 OP 511 DO 10.1136/thx.48.5.511 VO 48 IS 5 A1 D Davies YR 1993 UL http://thorax.bmj.com/content/48/5/511.abstract AB