The incidence of profound deafness in childhood: a three-year survey.
D002648:Child; D003430:Cross-Sectional Studies; D003638:Deafness / Q000453:epidemiology* / Q000209:etiology; D003906:Developing Countries; D005260:Female; D006801:Humans; D008297:Male; D009549:Nigeria; D012307:Risk Factors