Figure legends
Figure 1. Search plot diagram.
Figure 2. Forest plot and contour enhanced funnel plot
(preeclampsia vs control). Forest plot: Vertical line = ”no difference”
point between the two groups. Green squares = risk ratios; Diamonds =
pooled mean differences and 95 confidence intervals for all studies;
Horizontal black lines = 95% CI; Horizontal red line = 95% prediction
intervals. Contour enhanced funnel plot: 95% CI per level of
statistical significance, white color: p>.05, navy
blue: p<.05 , blue: p<.025 , light blue:p<.01 ).