Hearing impairment.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003638:Deafness / Q000523:psychology*; D006311:Hearing Disorders / Q000453:epidemiology / Q000209:etiology* / Q000523:psychology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009520:New Zealand; D010353:Patient Education as Topic