PMC:7143846 / 1804-1819 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T13","span":{"begin":0,"end":2},"obj":"Sentence"},{"id":"T14","span":{"begin":3,"end":15},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"1. Introduction"}