PMC:7253233 / 92-121 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T3","span":{"begin":3,"end":11},"obj":"Sentence"},{"id":"T4","span":{"begin":12,"end":22},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"?\n\nAbstract\nBackground\nThe co"}