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Silman, A., Macfarlane, G., Macfarlane, T., Silman, A., Macfarlane, G., & Macfarlane, T. (2018-10). Studies of disease occurrence: The population. In Epidemiological Studies: A Practical Guide. Oxford, UK: Oxford University Press. Retrieved 26 May. 2022, from https://oxfordmedicine.com/view/10.1093/med/9780198814726.001.0001/med-9780198814726-chapter-4.