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"Causes". nhs.uk (بالإنجليزية البريطانية). Archived from the original on 2018-03-28. Retrieved 2018-03-27.
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Deaf-Blindness, NCDB: National Center on. "Culture and Community". nationaldb.org (بالإنجليزية). Archived from the original on 2018-03-28. Retrieved 2018-03-27.