RT Journal Article SR Electronic T1 Ventilation tubes did not improve quality of life in persistent otitis media with effusion JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 121 OP 121 DO 10.1136/ebm.6.4.121 VO 6 IS 4 YR 2001 UL http://ebm.bmj.com/content/6/4/121.abstract AB