Columbia subject headings:
Fetus--Abnormalities--Congresses.
Fetus--Abnormalities--Diagnosis--Congresses.
Harvard subject headings:
Fetus--Abnormalities--Congresses
Fetus--Abnormalities--Diagnosis--Congresses
Princeton subject headings:
Fetus--Abnormalities--Congresses.
Fetus--Abnormalities--Diagnosis--Congresses.