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Pre- and posttreatment mean hearing thresholds for PTA in the five treatment groups. PTA—pure tone audiometry of 0.5, 1, 2, and 4 kHz; dB HL; the bars represent mean scores, the error bars represent standard deviations. *** p < 0.001; ** p < 0.01; * p < 0.05; n.s., not significant.
