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. 2017 Feb 17;21(4):323–328. doi: 10.1055/s-0037-1598601

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 5 — Mean hearing thresholds in the control group of men. Mean hearing thresholds in the control group throughout the sessions. The optimal thresholds for each ear are not concentrated in a single session. In the left ear, the means of sessions 3 and 4 were equal, and both represent the best thresholds, whereas in the right ear, the lowest threshold intensity was observed in session 2. Abbreviations: S1, session 1; S2, session 2; S3, session 3; S4, session 4.