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Title
Prospective assessment of breastfeeding and breast cancer incidence among 89,887 women.
Authors
Michels KB; Willett WC; Rosner BA; Manson JE; Hunter DJ; Colditz GA; Hankinson SE; Speizer FE; Michels, K B; Willett, W C; Rosner, B A; Manson, J E; Hunter, D J; Colditz, G A; Hankinson, S E; Speizer, F E