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(a) Forest plot of ARI for the affected side in four studies of AIS. Heterogeneity was low and non-significant (I2 = 37%, P = 0.16). (b) ARI for the unaffected side in four studies of AIS. Heterogeneity was low and non-significant (I2 = 0%, P = 0.99). In a sensitivity analysis, removing studies12,25 which used the same control participants did not significantly alter the results.
