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Baseline amplitude (2A) and changes in amplitudes 1 h after noise exposure (transient threshold shift: TTS) (2B) measured using distortion product otoacoustic emissions (DPOAE). All results are presented as mean ± SEM. There was no significant amplitude difference among the groups before noise exposure. After noise exposure, mean amplitudes at 4–8 KHz were significantly higher for groups A and B compared with the control group
