PMC:7210464 / 53414-53516 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T481","span":{"begin":0,"end":102},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"In fact, cities with higher population density have lower transmission rates in the second sub-sample."}