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Soluble fms‐like tyrosine kinase‐1 (sFlt‐1)/placental growth factor (PlGF) ratio at 20, 24 and 28 weeks in control group of women who did not develop pre‐eclampsia (PE; 
) and in those who developed early‐onset (
) or late‐onset (
) PE. Comparison with controls: *P < 0.001; †P = 0.15; ‡P = 0.21.
