Columbia subject headings:
Medical care--Utilization--United States.
Medicare.
Older people--Medical care--United States.
Preventive health services for older people--Utilization--United States.
Harvard subject headings:
Medical care--Utilization--United States.
Medicare.
Older people--Medical care--United States.
Preventive health services--Utilization--United States.
Princeton subject headings:
Medical care--Utilization--United States.
Medicare.
Older people--Medical care--United States.
Preventive health services for aged--Utilization--United States.