RT Journal Article SR Electronic T1 Review: oral Haemophilus influenzae vaccination reduces the number and severity of recurrent bronchitis episodes JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 108 OP 108 DO 10.1136/ebm.5.4.108 VO 5 IS 4 YR 2000 UL http://ebm.bmj.com/content/5/4/108.abstract AB