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Dyfyniad Arddull ChicagoTavani, A., E. Negri, S. Franceschi, F. Parazzini, and C. La Vecchia. Oral Contraceptives and Breast Cancer in Northern Italy. Final Report From a Case-control Study. Nature Publishing Group, 1993.
Dyfyniad MLATavani, A., et al. Oral Contraceptives and Breast Cancer in Northern Italy. Final Report From a Case-control Study. Nature Publishing Group, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.