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APA Citation
Hammond, G., Langridge, A., Leonard, H., Hagan, R., Jacoby, P., DeKlerk, N., Pennell, C., & Stanley, F. (n.d.). changes in risk factors for preterm birth in Western Australia 1984–2006. BJOG, 120(9), 1051–1060. http://access.bl.uk/ark:/81055/vdc_100024537312.0x000003