title: Breast cancer and oestrogen content of oral contraceptives.
mesh_terms: D000328:Adult; D000367:Age Factors; D001943:Breast Neoplasms / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects / Q000032:analysis*; D004967:Estrogens / Q000032:analysis*; D005260:Female; D006801:Humans
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens