title: From the Centers for Disease Control and Prevention. Preterm singleton births--United States, 1989-1996.
mesh_terms: D001723:Birth Rate / Q000208:ethnology / Q000639:trends; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D014481:United States / Q000453:epidemiology