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RETFLs for the B-81 are just like the values in ANSI S3.6-2018 for the B-71 bone tissue dildo. Air-bone gaps were observed for both transducers at reduced frequencies (250 and 500 Hz) as a result of occlusion results created by the circumaural earphone and also at high frequencies (3000 and 4000 Hz), formerly reported in several studies which used standard RETFLs. Test-retest differences for air conduction thresholds were reviewed in addition to results are provided in the Appendix A (Supplemental Digital information 1, http//links.
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