PMC:7796111 / 2177-2192 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T17","span":{"begin":0,"end":2},"obj":"Sentence"},{"id":"T18","span":{"begin":3,"end":15},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"1. Introduction"}