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Koritsas S, Iacono T. Secondary conditions in people with developmental disability. Am J Intellect Dev Disabil. 2011 Jan;116(1):36-47

Impaired hearing and deafness

What are impaired hearing and deafness? The WHO definition of hearing impairment is a hearing loss of more than 25 dB in the best ear. The international consensus is that the average loss should be...

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