RT Journal Article SR Electronic T1 The administration of pertussis vaccine to pregnant women was associated with a small increased risk of chorioamnionitis, but not an increased risk of hypertensive disorders or preterm birth JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 73 OP 73 DO 10.1136/ebmed-2014-110149 VO 20 IS 2 A1 Michael R Millar A1 Marta Gonzalez Sanz YR 2015 UL http://ebm.bmj.com/content/20/2/73.abstract AB