Columbia subject headings:
Collecting of accounts--United States.
Hospitals--United States--Business management.
Medically uninsured persons--United States.
Harvard subject headings:
Collecting of accounts--United States.
Hospitals--United States--Business management.
Medically uninsured persons--United States.
Princeton subject headings:
Collecting of accounts--United States.
Hospitals--United States--Business management.
Medically uninsured persons--United States.