RT Journal Article SR Electronic T1 Review: addition of salmeterol leads to improved lung function and fewer exacerbations in symptomatic asthma JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 15 OP 15 DO 10.1136/ebn.4.1.15 VO 4 IS 1 YR 2001 UL http://ebn.bmj.com/content/4/1/15.abstract AB