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Vaal J., Gussekloo J., de Klerk M.M, Frijters D.H, Evenhuis H.M, van Beek A.P, van Nispen R.M, Smits C., Deeg D.J.  2007.  [Combined vision and hearing impairment: in an estimated 30,000-35,000 people aged 55 years or over in The Netherlands].. Nederlands Tijdschrift voor Geneeskunde. 151(26):1459-63.