Columbia subject headings:
Family medicine--United States.
Medical education policy--United States.
Medical policy--United States.
Nurse practitioners--United States.
Physicians' assistants--United States.
Physicians--United States.
Harvard subject headings:
Medical education policy--United States.
Medical policy--United States
Nurse practitioners--United States
Physicians' assistants--United States
Physicians--United States
Primary care (Medicine)--United States.
Princeton subject headings:
Medical education policy--United States.
Medical policy--United States.
Nurse practitioners--United States.
Physicians' assistants--United States.
Physicians--United States.
Primary care (Medicine)--United States.