Columbia subject headings:
Health insurance--United States--Statistics.
Medical care, Cost of--United States--Statistics.
Medical care--Utilization--United States--Statistics.
Harvard subject headings:
Health insurance--United States--Statistics
Medical care, Cost of--United States--Statistics
Medical care--Utilization--United States--Statistics
Princeton subject headings:
Health insurance--United States--Statistics.
Medical care, Cost of--United States--Statistics.
Medical care--Utilization--United States--Statistics.
Statistics.