PMC:7784787 / 11434-11741 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T102","span":{"begin":0,"end":149},"obj":"Sentence"},{"id":"T103","span":{"begin":150,"end":307},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The FFP1 mask is the only one which must pass a fit test to be awarded a CE mark, and indeed it showed the lowest leakage and undetected penetration. For the other mask types, the fabrics with lower penetration showed higher leakage, indicating that these masks displayed a trade-off between fabric and fit."}