Columbia subject headings:
Diagnostic ultrasonic imaging.
Fetus--Abnormalities--Diagnosis.
Fetus--Physiology.
Newborn infants--Diseases--Diagnosis.
Newborn infants--Physiology.
Ultrasonics in obstetrics.
Harvard subject headings:
Diagnostic ultrasonic imaging
Fetus--Abnormalities--Diagnosis
Fetus--Physiology
Newborn infants--Diseases--Diagnosis
Newborn infants--Physiology
Ultrasonics in obstetrics
Princeton subject headings: