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Median matrix metalloproteinase 9 (MMP-9) levels in patient's sera at admission, 6, 24, and 48 h from admission [H0, admission; H6, hour 6; H24, hour 24; H48, hour 48; Wilcoxon test for matched samples comparing MMP-9 levels at each time with the time before (*p < 0.05)].
