title: Low-oestrogen oral contraceptives.
mesh_terms: D002626:Chemistry, Pharmaceutical; D003276:Contraceptives, Oral; D003280:Contraceptives, Oral, Synthetic; D004338:Drug Combinations
chemical_list: D003276:Contraceptives, Oral; D003280:Contraceptives, Oral, Synthetic; D004338:Drug Combinations