RT Journal Article SR Electronic T1 Combined budesonide and formoterol for maintenance and relief provided better asthma control than budesonide for maintenance and terbutaline for relief JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 138 OP 138 DO 10.1136/ebm.11.5.138 VO 11 IS 5 YR 2006 UL http://ebm.bmj.com/content/11/5/138.abstract AB