Columbia subject headings:
Managed care plans (Medical care)--United States.
Managed mental health care--United States.
Provider-sponsored organizations (Medical care)--United States.
Substance abuse--Treatment--United States.
Harvard subject headings:
Managed care plans (Medical care)--Law and legislation--United States.
Preferred provider organizations (Medical care)--Law and legislation--United States.
Princeton subject headings:
Managed care plans (Medical care)--Law and legislation--United States.
Preferred provider organizations (Medical care)--Law and legislation--United States.