Oral contraceptives and breast cancer: a case-control study with hospital and community controls.
Spain
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WT
D001943:Breast Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D016022:Case-Control Studies; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D015994:Incidence
D003276:Contraceptives, Oral