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APA Citation
Jensen, E., Daniels, J., Stürmer, T., Robinson, W., Williams, C., Vejrup, K., Magnus, P., & Longnecker, M. (n.d.). hormonal contraceptive use before and after conception in relation to preterm birth and small for gestational age: an observational cohort study. BJOG, 122, 1349–1361. http://access.bl.uk/ark:/81055/vdc_100026253000.0x00002c