RT Journal Article SR Electronic T1 2009/H1N1 infection in pregnancy association with adverse perinatal outcomes JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 11 OP 12 DO 10.1136/ebn.2011.100205 VO 15 IS 1 A1 May Li Lim YR 2012 UL http://ebn.bmj.com/content/15/1/11.abstract AB