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(a) Forest plot of phase for the affected side in nine studies of AIS. Heterogeneity is high and also significant (I2 = 94%, P < 0.00001). (b) Phase for the unaffected side of nine studies. Heterogeneity is high and significant (I2 = 94%, P < 0.00001). In a sensitivity analysis, removing studies23,24 which used the same control participants did not alter the results.
