RT Journal Article SR Electronic T1 Smokers and ex-smokers with chronic stable asthma did not respond to high dose oral corticosteroids JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 115 OP 115 DO 10.1136/ebm.9.4.115 VO 9 IS 4 YR 2004 UL http://ebm.bmj.com/content/9/4/115.abstract AB