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Sauerbrei, W., Hübner, K., Schmoor, C. et al. Validation of existing and development of new prognostic classification schemes in node negative breast cancer. Breast Cancer Res Treat 48, 191–192 (1998). https://doi.org/10.1023/A:1006062513518
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DOI: https://doi.org/10.1023/A:1006062513518