PMC:7784787 / 8032-8155 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T67","span":{"begin":0,"end":123},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The filter covers the area of the mouth and nose but around chin, cheeks and nose bridge the fabric is just a single layer."}