Davis, Daniel H.J., Barnes, Linda E., Stephan, Blossom C.M., Maclullich, Alasdair M.J., Meagher, David, Copeland, John, Matthews, Fiona E., Brayne, Carol, "The descriptive epidemiology of delirium symptoms in a large population-based cohort study: Results from the Medical Research Council Cognitive Function and Ageing Study (MRC CFAS)", BMC Geriatrics, 2014