title: Progesterone-only contraceptives.
mesh_terms: D002986:Clinical Trials as Topic; D003276:Contraceptives, Oral; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D011247:Pregnancy; D011374:Progesterone
chemical_list: D003276:Contraceptives, Oral; D011374:Progesterone