PMC:7784787 / 895-1055 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T16","span":{"begin":2,"end":127},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":". However, mask performance varies considerably depending on the fabric from which they are made, and how they fit on the face.\n\nOn 26 December 2019, a 41-year-"}