[Contraceptive efficiency and side effects of oral microdoses of Norgestrel].
D000328:Adult; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D007659:Ketones / Q000008:administration & dosage* / Q000009:adverse effects; D011247:Pregnancy; D011278:Pregnanes / Q000008:administration & dosage* / Q000009:adverse effects
D003276:Contraceptives, Oral; D007659:Ketones; D011278:Pregnanes
Eficacia contraceptiva y efectos secundarios de microdosis orales de Norgestrel.