Columbia subject headings:
Harvard subject headings:
Cancer--Treatment--Complications--Congresses.
Mouth--Cancer--Congresses
Mucous membrane--Diseases--Congresses.
Mucous membrane--Infections--Congresses.
Princeton subject headings:
Cancer--Treatment--Complications--Congresses.
Mouth--Cancer--Congresses.
Mucous membrane--Diseases--Congresses.
Mucous membrane--Infections--Congresses.