Columbia subject headings:
Ear--Diseases.
Electrotherapeutics.
Eye--Diseases.
Nose--Diseases.
Throat--Diseases.
Harvard subject headings:
Electrotherapeutics
Eye--Diseases--Cases, clinical reports, statistics.
Princeton subject headings:
Ear--Diseases.
Electrotherapeutics.
Eye--Diseases.
Nose--Diseases.
Throat--Diseases.