PMC:7796291 / 1572-1764 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T11","span":{"begin":26,"end":28},"obj":"Sentence"},{"id":"T12","span":{"begin":29,"end":41},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"methods for respirators.\n\n1. Introduction\nThe demand for face filtering respirators has grown continuously to cope with various environmental hazards including fine dust, liquid mist, bioaeros"}