title: The hearing-aid program of the Veterans Administration: twenty years of service.
mesh_terms: D012048:Correction of Hearing Impairment; D004467:Economics; D006296:Health Services; D006310:Hearing Aids / Q000592:standards; D006801:Humans; D007221:Industry; D012106:Research; D014481:United States; D014493:United States Department of Veterans Affairs