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Meta-analysis by pre-eclampsia and non-gravid hypertension subgroup in the ELISA group. Studies included in the ELISA group were divided into 2 subgroups: pre-eclampsia and non-gravid hypertension subgroups. Heterogeneity was not found in both subgroups. CI = confidence interval, ELISA = enzyme-linked immunosorbent assay, OR = odds ratio, PE = pre-eclampsia.
