MMP9 and epilepsy: The meta-analysis indicated that the MMP-9 levels in China (SMD = 5.15, 95% CI = 1.62–8.68, p = 0.004; Figure 3A), Poland (SMD = 5.31, 95% CI = 2.47–8.16, p = 0.0003; Figure 3A), and Egypt (SMD = 1.31, 95% CI = 0.91–1.71, p < 0.00001; Figure 3A) in epilepsy patients were higher than those in the control group.