Deafness as a world problem.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003638:Deafness / Q000453:epidemiology* / Q000209:etiology / Q000534:rehabilitation; D004519:Education, Special; D014943:Global Health; D006310:Hearing Aids / Q000600:supply & distribution; D006317:Hearing Loss, Noise-Induced / Q000453:epidemiology; D006801:Humans; D007223:Infant