Selection of hearing aids.
D000368:Aged; D001299:Audiometry; D002648:Child; D004425:Ear Cartilage; D004431:Ear, External; D011211:Electric Power Supplies; D004582:Electronics, Medical / Q000295:instrumentation; D006310:Hearing Aids / Q000009:adverse effects / Q000145:classification; D006320:Hearing Tests; D006801:Humans; D013677:Medical Laboratory Science; D008904:Miniaturization; D009181:Mycoses / Q000209:etiology; D010032:Otitis Externa / Q000209:etiology; D010342:Patient Acceptance of Health Care; D013063:Speech Discrimination Tests