PMC:7253482 / 3194-3206 JSONTXT

{"project":"LitCovid-sample-Enju","denotations":[{"id":"T488","span":{"begin":2,"end":3},"obj":"-RRB-"},{"id":"T489","span":{"begin":3,"end":8},"obj":"CD"},{"id":"T490","span":{"begin":8,"end":9},"obj":"-COMMA-"}],"text":"nv)19–21, in"}