Columbia subject headings:
Health surveys--United States--Databases.
Medical care surveys--United States--Databases.
Older people--Health and hygiene--United States--Statistics--Databases.
United States--Statistics, Medical--Databases.
Harvard subject headings:
Health surveys--United States.
Medical care survey--United States.
Older people--Health and hygiene--United States--Statistics.
United States--Statistics, Medical.
Princeton subject headings: