Columbia subject headings:
Harvard subject headings:
Medical care--Canada--Congresses.
Medical care--United States--Congresses
Medicine--Specialties and specialists--Canada--Congresses.
Medicine--Specialties and specialists--United States--Congresses.
Princeton subject headings:
Medical care--Canada--Congresses.
Medical care--United States--Congresses.
Medicine--Specialities and specialists--Canada--Congresses.
Medicine--Specialities and specialists--United States--Congresses.