title: Early experience in contraception with a new progestogen.
mesh_terms: D003276:Contraceptives, Oral / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D011372:Progestins / Q000009:adverse effects / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral; D011372:Progestins