RT Journal Article SR Electronic T1 Meta-analysis suggests that metformin may reduce pre-eclampsia compared with insulin use during pregnancy JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 72 OP 73 DO 10.1136/bmjebm-2018-110975 VO 24 IS 2 A1 Denice Feig YR 2019 UL http://ebm.bmj.com/content/24/2/72.abstract AB