Delirium is a strong risk factor for dementia in the oldest-old: a population-based cohort study.
Davis DH, Muniz Terrera G, Keage H, Rahkonen T, Oinas M, Matthews FE, Cunningham C, Polvikoski T, Sulkava R, MacLullich AM, et al. Brain. 2012 Sep; 135(Pt 9):2809-16. Epub 2012 Aug 9.