Columbia subject headings:
Childbirth--United States.
Maternal health services--Moral and ethical aspects--United States.
Maternal health services--United States.
Natural childbirth--United States.
Prenatal care--Moral and ethical aspects--United States.
Prenatal care--United States.
Harvard subject headings:
Childbirth--United States.
Maternal health services--Moral and ethical aspects--United States.
Maternal health services--United States.
Natural childbirth--United States.
Prenatal care--Moral and ethical aspects--United States.
Prenatal care--United States.
Princeton subject headings: