Hearing protection works!
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HTI Inc., Worthington, Ohio, USA.
D001299:Audiometry; D001309:Auditory Threshold; D004430:Ear Protective Devices / Q000592:standards*; D034381:Hearing Loss / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D009622:Noise / Q000009:adverse effects*; D016273:Occupational Exposure / Q000517:prevention & control* / Q000592:standards; D011237:Predictive Value of Tests; D015397:Program Evaluation; D014481:United States; D014489:United States Occupational Safety and Health Administration / Q000592:standards*