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Meuwese-Jongejeugd A, van Splunder J, Vink M, Stilma JS, van Zanten B, Verschuure H, Bernsen R, Evenhuis H. Combined sensory impairment (deaf-blindness) in five percent of adults with intellectual disabilities. Am J Ment Retard. 2008 Jul;113(4):254-62

Meuwese-Jongejeugd A, van Splunder J, Vink M, Stilma JS, van Zanten B, Verschuure H, Bernsen R, Evenhuis H. Combined sensory impairment (deaf-blindness) in five percent of adults with intellectual disabilities. Am J Ment Retard. 2008 Jul;113(4):254-62