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In the version of this article initially published, in the second sentence of the section 'Identification and study of at-risk individuals', incorrect references were cited and the appropriate references were omitted. The references that should have been cited are:

Corder, E. H. et al. Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease in late onset families. Science 261, 921-923 (1993).

Saunders, A. M. et al. Association of apolipoprotein E allele ε4 with late-onset familial and sporadic Alzheimer's disease. Neurology 43, 1467-1472 (1993).

The error has been corrected for the HTML and PDF versions of the article.