title: A Latin American field trial with a once-a-month oral contraceptive.
mesh_terms: D000328:Adult; D003276:Contraceptives, Oral / Q000627:therapeutic use*; D004967:Estrogens / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects; D011800:Quinestrol / Q000627:therapeutic use; D013020:South America
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens; D011800:Quinestrol