RT Journal Article SR Electronic T1 Review: small treatment effect of disodium cromoglycate in childhood asthma is tempered by methodological flaws and publication bias JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 106 OP 106 DO 10.1136/ebm.6.4.106 VO 6 IS 4 YR 2001 UL http://ebm.bmj.com/content/6/4/106.abstract AB