Columbia subject headings:
Generative organs, Female--Diseases.
Generative organs, Male--Diseases.
Genitourinary organs--Infections.
Sexually transmitted diseases.
Urethra--Diseases.
Urethra--Stricture.
Harvard subject headings:
Generative organs, Female--Diseases
Generative organs, Male--Diseases
Genitourinary organs--Infections
Sexually transmitted diseases
Urethra--Diseases
Urethra--Stricture
Princeton subject headings: