Columbia subject headings:
Harvard subject headings:
Catecholamines--Analysis--Congresses.
Endorphins--Analysis--Congresses.
Heart--Diseases--Diagnosis--Congresses.
Prostaglandins--Analysis--Congresses.
Radioimmunoassay--Congresses.
Princeton subject headings:
Catecholamines--Analysis--Congresses.
Endorphins--Analysis--Congresses.
Heart--Diseases--Diagnosis--Congresses.
Prostaglandins--Analysis--Congresses.
Radioimmunoassay--Congresses.