Columbia subject headings:
Fetus--Diseases--Etiology.
Fetus--Diseases--Prevention.
Maternal health services--United States.
Newborn infants--Diseases--Prevention.
Pregnancy--Complications--Prevention.
Harvard subject headings:
Fetus--Diseases--Etiology.
Fetus--Diseases--Prevention.
Maternal health services--United States.
Newborn infants--Diseases--Prevention.
Pregnancy--Complications--Prevention.
Princeton subject headings: