1. https://www.umass.edu/statdata/statdata/data
2. Delirium in the intensive care unit;Morandi;International Review of Psychiatry 21(1),2009
3. Girard TD, Pandharipande PP, Ely EW (2008) Delirium in the intensive care unit. Critical Care 12(S3).
4. Belayachi J, Dendane T, Madani N, Abidi K, Abouqal R, et al. (2012) Factors predicting mortality in elderly patients admitted to a Moroccan medical intensive care unit. Southern African Journal of Critical Care 28(1): 22-27.
5. Mortality risk factors and validation of severity scoring systems in critically ill patients with acute renal failure;Lima;Renal failure 27(5),2005