Efficacy of a new ear-plug: Takeda's ear-plug (untone).
D000328:Adult; D001309:Auditory Threshold; D004430:Ear Protective Devices / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011312:Pressure; D011482:Protective Devices / Q000592:standards*; D013016:Sound