PMC:7543426 / 130-177 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T4","span":{"begin":8,"end":16},"obj":"Sentence"},{"id":"T5","span":{"begin":18,"end":28},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"bstract\nAbstract\n\nBackground\nDescriptions of th"}