Columbia subject headings:
Clinical medicine--Research--United States--History--20th century.
Medicine--Research--United States--History--20th century.
Harvard subject headings:
Clinical medicine--Research--United States--History--20th century.
Medicine--Research--United States--History--20th century.
Princeton subject headings:
Clinical medicine--Research--United States--History--20th century.
Medicine--Research--United States--History--20th century.