title: Patterns of prenatal care in the United States.
authors: E
authors: E
authors: Hemminki
authors: D
authors: D
authors: McNellis
authors: H J
authors: HJ
authors: Hoffman
mesh_terms: D005060:Europe; D005260:Female; D006801:Humans; D011247:Pregnancy; D011295:Prenatal Care / Q000639:trends*; D011787:Quality of Health Care; D014481:United States