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Cole , . (1997-04-24). 3. Sampling, study size, and power. In Design Concepts in Nutritional Epidemiology. : Oxford University Press,. Retrieved 16 Jul. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780192627391.001.0001/acprof-9780192627391-chapter-3.