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Forest plot of the efficacy of CCBs versus other medicines. Four studies with a total of 449 participants reported the number of patient with successful treatment. Significant heterogeneity was observed among enrolled studies (I2 = 97%, P <.05). No significant difference between CCB and the control group (RR = 2.64, 95% CI: 0.95, 7.29). CCB = calcium channel blockers, CI = confidence interval, RR = risk ratio.
