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