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Thorpe, S.M., Rose, C., Pedersen, B.V. et al. The influence of parity on estrogen and progesterone receptors in primary breast cancer. Breast Cancer Res Tr 2, 414–416 (1982). https://doi.org/10.1007/BF01805888
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DOI: https://doi.org/10.1007/BF01805888