RT Journal Article SR Electronic T1 Cytokines in asthma JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 825 OP 857 DO 10.1136/thx.54.9.825 VO 54 IS 9 A1 K F Chung A1 P J Barnes YR 1999 UL http://thorax.bmj.com/content/54/9/825.abstract AB