PMC:7551987 / 1862-1877 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T11","span":{"begin":0,"end":2},"obj":"Sentence"},{"id":"T12","span":{"begin":3,"end":15},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"1. Introduction"}