PMC:7164859 / 9363-9415 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T120","span":{"begin":3,"end":7},"obj":"UBERON:0012283"},{"id":"T80077","span":{"begin":3,"end":7},"obj":"UBERON:0012283"}],"text":"or FFP3. FFP2 masks meet the filter efficiency crite"}