PMC:7784787 / 3221-3356 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T30","span":{"begin":7,"end":109},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"d fit.\nFace masks worn in a pandemic function more effectively as source control rather than protection [17]. Particles can escape from"}