[On the contraceptive effectiveness of gestagens].
D003267:Contraception / Q000706:statistics & numerical data*; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003273:Contraceptive Devices; D003276:Contraceptives, Oral / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D006801:Humans; D011374:Progesterone / Q000031:analogs & derivatives; D011372:Progestins
D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D004967:Estrogens; D011372:Progestins; D011374:Progesterone
CONTRACEPTION/statistics; CONTRACEPTIVES, ORAL/pharmacology; ESTROGENS/pharmacology; PROGESTERONE/related compounds