1. Delirium: acute confusional states;Lipowski,1990
2. A prospective study of delirium in hospitalized elderly;Francis;JAMA,1990
3. A prospective study of delirium and prolonged hospital stay;Thomas;Arch Gen Psychiatry,1988
4. Excess mortality in general hospital patients with delirium;Hemert;J Psychosomatic Res,1994
5. Epidemiology of delirium: an overview of research issues and findings;Levkoff,1991