Oestrogen content of oral contraceptives.
D003276:Contraceptives, Oral / Q000032:analysis*; D004967:Estrogens / Q000009:adverse effects / Q000032:analysis*; D005260:Female; D006801:Humans; D013923:Thromboembolism / Q000139:chemically induced
D003276:Contraceptives, Oral; D004967:Estrogens