[Decrease of births in the USA].
D000293:Adolescent; D000328:Adult; D001723:Birth Rate; D003276:Contraceptives, Oral; D004467:Economics; D005193:Family Planning Services; D005260:Female; D006801:Humans; D011155:Population Control; D011247:Pregnancy; D014481:United States
D003276:Contraceptives, Oral
Geburtenrückgang in den USA.