[Attenuation efficiency of hearing protectors for workers exposed to noise].
D000328:Adult; D004430:Ear Protective Devices / Q000592:standards*; D005069:Evaluation Studies as Topic; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D009784:Occupational Diseases / Q000517:prevention & control*; D011482:Protective Devices / Q000592:standards*; D011795:Surveys and Questionnaires