Columbia subject headings:
Digestive organs--Diseases--Congresses.
Gastroenterology--Congresses.
Medical emergencies--Congresses.
Harvard subject headings:
Gastroenterology--Congresses.
Gastrointestinal emergencies--Congresses.
Princeton subject headings:
Digestive organs--Diseases--Congresses.
Gastroenterology--Congresses.
Medical emergencies--Congresses.