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Britton, A. (2010-06-03). Evaluating interventions: experimental study designs in health promotion. In Evaluating Health Promotion: Practice and Methods. : Oxford University Press. Retrieved 20 Oct. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199569298.001.0001/acprof-9780199569298-chapter-004.