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Elwood, J. (2007-02-22). Critical appraisal of a retrospective cohort study. In Critical Appraisal of Epidemiological Studies and Clinical Trials. : Oxford University Press. Retrieved 29 Feb. 2020, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198529552.001.0001/acprof-9780198529552-chapter-13.