Observations on the use of certain orally active progestogens for the control of fertility in women.
D003270:Contraceptive Agents; D003276:Contraceptives, Oral; D005260:Female; D005298:Fertility; D006801:Humans; D011372:Progestins
D003270:Contraceptive Agents; D003276:Contraceptives, Oral; D011372:Progestins
CONTRACEPTIVES, ORAL