title: Age-specific secular changes in oral contraceptive use.
mesh_terms: D000328:Adult; D000367:Age Factors; D003276:Contraceptives, Oral; D004363:Drug Utilization; D005260:Female; D006801:Humans; D008875:Middle Aged; D013997:Time Factors; D014481:United States
chemical_list: D003276:Contraceptives, Oral