PMC:7258756 / 6228-6326 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T48","span":{"begin":9,"end":27},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" cases.\n\nMaterial \u0026 Methods\nThe clinical samples were referred by the hospital authorities through"}