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Peppa, M, Thomas, S, Kempley, S, Mangtani, P and Walker, J Codelists for: "Seasonal influenza vaccination during pregnancy and the risk of major congenital malformations in live-born infants: A 2010-2016 historical cohort study". [Project]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001629.