| http://www.w3.org/ns/prov#value | - Many have also developed chronic heartburn caused by a stomach acid condition known as Gastroesophageal reflux disease.Doctors at clinics that treat ground zero workers and volunteers believe that exposure to the dust, which was made up of tons of pulverized concrete, glass and other building materials, may have irritated some people's upper respiratory systems so much that many still have not reco
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