Columbia subject headings:
Ear--Diseases--Congresses.
Ear--Surgery--Congresses.
Facial nerve--Diseases--Congresses.
Facial pain--Surgery--Congresses.
Skull--Surgery--Congresses.
Harvard subject headings:
Ear--Diseases--Congresses.
Ear--Surgery--Congresses.
Facial nerve--Diseases--Congresses.
Facial pain--Surgery--Congresses.
Skull base--Surgery--Congresses.
Princeton subject headings: