PMC:7543426 / 128-153 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T3","span":{"begin":1,"end":9},"obj":"Sentence"},{"id":"T4","span":{"begin":10,"end":18},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"\nAbstract\nAbstract\n\nBackg"}