PMC:7333997 / 1648-1655 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T11","span":{"begin":3,"end":6},"obj":"CHEBI:8102;CHEBI:8102"},{"id":"T97518","span":{"begin":3,"end":6},"obj":"CHEBI:8102;CHEBI:8102"}],"text":"of PM2."}