RT Journal Article SR Electronic T1 Maintenance and symptom relief with budesonide plus formoterol reduced severe asthma exacerbations JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 78 OP 78 DO 10.1136/ebn.8.3.78 VO 8 IS 3 YR 2005 UL http://ebn.bmj.com/content/8/3/78.abstract AB