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Forest plot of the effect of potassium supplementation on flow-mediated dilation (FMD). Results are expressed as mean difference (MD) and 95% confidence intervals (95% CI). Squares indicate study-specific relative risk estimates (size of the square reflects the study-specific statistical weight); horizontal lines indicate 95% CI; diamond indicates the overall relative risk with its 95% CI. UK: urinary potassium excretion (mmol/24 h).
