RT Journal Article SR Electronic T1 Allergen-specific immunotherapy improves asthma symptoms compared with placebo, but the possibility of adverse effects should be considered JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 16 OP 17 DO 10.1136/ebm1144 VO 16 IS 1 A1 Rabia Rashid A1 Anthony J Frew YR 2011 UL http://ebm.bmj.com/content/16/1/16.abstract AB