[Effects of steroid agents as contraceptives after 2 to 6 years of continuous use].
D003270:Contraceptive Agents / Q000494:pharmacology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D013256:Steroids / Q000494:pharmacology*
D003270:Contraceptive Agents; D013256:Steroids
Efectos de los agentes esteroideos en el control de la fertilidad despues de 2 a 6 años de uso continuo.