PMC:7253233 / 91-114 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T3","span":{"begin":4,"end":12},"obj":"Sentence"},{"id":"T4","span":{"begin":13,"end":23},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"n?\n\nAbstract\nBackground"}