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APA Citation
Croton, R., Cooke, T., Holt, S., George, W. D., Nicolson, R., & Griffiths, K. (1981). oestrogen receptors and survival in early breast cancer.. BMJ, 283(6302), 1289–1291. http://access.bl.uk/ark:/81055/vdc_100137835224.0x00004b