Columbia subject headings:
Harvard subject headings:
AIDS (Disease)--Social aspects--United States
AIDS (Disease)--Switzerland.
Intravenous drug abuse--United States.
Needle sharing--Switzerland.
Needle sharing--United States.
Princeton subject headings:
AIDS (Disease)--Social aspects--United States.
Drug addiction--United States.
Intravenous drug abuse--United States.
Needle sharing--United States.