RT Journal Article SR Electronic T1 Inactivated influenza vaccination in first trimester does not appear to increase risk of birth defects JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 107 OP 107 DO 10.1136/eb-2017-102777 VO 20 IS 4 A1 Annette Regan YR 2017 UL http://ebn.bmj.com/content/20/4/107.abstract AB