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Ward, H., Toledano, M., Shaddick, G., Davies, B., & Elliott, P. (2012-05). Finding and summarizing evidence. In Oxford Handbook of Epidemiology for Clinicians. Oxford, UK: Oxford University Press. Retrieved 19 Oct. 2019, from https://oxfordmedicine.com/view/10.1093/med/9780198529880.001.0001/med-9780198529880-chapter-004.