| http://www.w3.org/ns/prov#value | - prev1 of 7nextView AllNational Survey of America???s HealthBy Alexandra Sifferlin @acsifferlinSept. 24, 20130OJO Images/Robert Daly / Getty ImagesThe National Health Interview Survey (NHIS) provides a peek into the health of the nation, and has been monitoring things such as smoking rates, obesity and physical activity since 1957.
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