PMC:7784787 / 10401-10631 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T92","span":{"begin":0,"end":82},"obj":"Sentence"},{"id":"T93","span":{"begin":83,"end":171},"obj":"Sentence"},{"id":"T94","span":{"begin":172,"end":230},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Top row: (A) no mask, (B) three-layer textile mask, (C) single-layer textile mask. Bottom row: (D) CE marked FFP1 PPE mask, (E) CE marked Type 2 medical mask, (F) bandana. Intensity scaled to 100–20,000 counts with ‘bb’ colourmap."}