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Zhang, J., Joseph, K., & Fraser, W. (2011-02-23). Obstetric Intervention. In  (Ed.), Reproductive and Perinatal Epidemiology. : Oxford University Press,. Retrieved 19 Feb. 2019, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195387902.001.0001/acprof-9780195387902-chapter-007.