Hearing impairment, hearing aids and audiology.
D001298:Audiology; D001299:Audiometry; D006310:Hearing Aids / Q000706:statistics & numerical data*; D006311:Hearing Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy*; D006801:Humans; D014481:United States; D000078329:Workforce