| http://www.w3.org/ns/prov#value | - As costs continue to rise, tasks that were previously performed by doctors, nurses, dentists, or other health-care professionals increasingly are being performed by physician assistants, medical assistants, dental hygienists, and physical therapist aides.Michael Greenstone, a former staff member for the White House Council of Economic Advisers, says it is premature to make too much of where the
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