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Tryggvadóttir, L., Tulinius, H. & Gudmundsdóttir, G. Oral contraceptive (OC) use and risk of breast cancer - reply. Br J Cancer 76, 417–418 (1997). https://doi.org/10.1038/bjc.1997.401
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DOI: https://doi.org/10.1038/bjc.1997.401
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