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viagra from canada The analysis was carried out on pooled data from a nested case control study of the Mayo mammography health study MMHS, and from five case control studies Australian breast cancer family study ABCFS, Bavarian breast cancer cases and controls BBCC, Mayo clinic breast cancer study MCBCS, Ontario familial breast cancer registry OFBCR, and the Singapore and Sweden breast cancer study SASBAC, two nested case control studies Melbourne collaborative cohort study MCCS and the Multi ethnic cohort MEC, one cohort study European prospective investigation into cancer and nutrition EPIC and one family study Sisters in breast screening study SIBS, participating in the Breast Cancer Association Consortium BCAC 32; EPIC and SIBS samples are part of SEARCH 33 within BCAC

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