RT Journal Article SR Electronic T1 Review: previous caesarean delivery or abortion increases the risk of placenta praevia JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 85 OP 85 DO 10.1136/ebn.1.3.85 VO 1 IS 3 YR 1998 UL http://ebn.bmj.com/content/1/3/85.abstract AB