| http://www.w3.org/ns/prov#value | - We are using activity here as a biomarker, similar to the way you might use blood pressure, said University of Texas Medical Branch at Galveston assistant professor Steve R. Fisher, lead author of a paper in Journals of Gerontology Series A. While we can not say whether activity is a cause or effect in these cases, we can use it as a marker to tell us whether a person is at high risk and we need t
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