No abstract available
MeSH terms
-
Female
-
Humans
-
Infant, Low Birth Weight
-
Infant, Newborn
-
Infant, Premature
-
Obstetric Labor, Premature / epidemiology*
-
Obstetric Labor, Premature / prevention & control
-
Pregnancy
-
Prenatal Care / trends*
-
United States / epidemiology