Columbia subject headings:
Fetus--Research--United States.
Fetus--Research.
Human experimentation in medicine--United States.
Human experimentation in medicine.
Harvard subject headings:
Fetus--Research
Fetus--Research--United States.
Human experimentation in medicine--United States
Human experimentation in medicine.
Princeton subject headings:
Fetus--Research--United States.
Fetus--Research.
Human experimentation in medicine--United States.
Human experimentation in medicine.