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Forest plot of individual studies and pooled mean difference of ionized magnesium between alcohol group and controls, including 95% confidence intervals (95%-CI). The size of the squares is related to the weight of each study. Number of patients and control subjects in each study: Hristova [29]: controls n = 40, patients n = 31; Ordak [34]: controls n = 50, patients n = 100; Saha [32]: controls n = 75, patients n = 40.
