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Streiner, D., & Norman, G. (2008-09-04). Measuring change. In Health Measurement Scales: A practical guide to their development and use. : Oxford University Press. Retrieved 17 Feb. 2020, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199231881.001.0001/acprof-9780199231881-chapter-11.