We have completed a survey of the causes of deafness in 3,064 children with defective hearing who attend special schools in Southern Africa. Specific genetic or multifactorial syndromes were diagnosed in 7 per cent, familial undifferentiated deafness was recognized in 11 per cent, while in 25 per cent the deafness was acquired.
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Sellars et al. (1983) studied this question.
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