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    Oral contraceptive use by formulation and breast cancer risk by subtype in the Nurses' Health Study II: a prospective cohort study by Burchardt, Norah Ana (Author) , Eliassen, A. Heather (Author) , Shafrir, Amy L. (Author) , Rosner, Bernard (Author) , Tamimi, Rulla M. (Author) , Kaaks, Rudolf (Author) , Tworoger, Shelley S. (Author) , Fortner, Renée T. (Author) ,


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