PMC:7784787 / 640-829 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T12","span":{"begin":74,"end":146},"obj":"Sentence"},{"id":"T13","span":{"begin":148,"end":166},"obj":"Sentence"},{"id":"T14","span":{"begin":168,"end":186},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"tration through the mask fabric and leakage around the edges of the mask. A large variation in both material penetration and leakage was observed.\n\nGraphical abstract\n\nTweetable abstract\nFa"}