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Effect of β-blockers on platelet aggregation by agonists. Forest plot of standardized mean differences (SMD) of the effects of β-blockers on platelet aggregation by different agonists. Abbreviations are as follows, ADP, adenosine diphosphate; CI, confidence interval. *Median (interquartile range) concentrations of the used agonists. Thrombin was used only for measurement of threshold concentration platelet aggregation
