title: A study on contraceptive use. Effectiveness of the 75 mcg. ethinyl estradiol sequential therapy.
mesh_terms: D000328:Adult; D003276:Contraceptives, Oral; D003279:Contraceptives, Oral, Sequential; D004997:Ethinyl Estradiol / Q000008:administration & dosage*; D005260:Female; D006801:Humans
chemical_list: D003276:Contraceptives, Oral; D003279:Contraceptives, Oral, Sequential; D004997:Ethinyl Estradiol