Columbia subject headings:
Coronary heart disease--Congresses.
Heart valves--Diseases--Congresses.
Heart--Abnormalities--Congresses.
Heart--Surgery--Congresses.
Harvard subject headings:
Coronary heart disease--Congresses.
Heart valves--Diseases--Congresses.
Heart--Abnormalities--Congresses
Heart--Surgery--Congresses
Princeton subject headings: