PMC:7796291 / 13610-13756 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T123","span":{"begin":21,"end":120},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"tration performance. Without disinfection treatments, both respirators showed very high filtration efficiency of ≥99.5%. It should be noted that t"}