PMC:7784787 / 198-468 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T6","span":{"begin":126,"end":146},"obj":"Sentence"},{"id":"T7","span":{"begin":147,"end":214},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"vel method of measuring mask performance which can simultaneously assess both fabric penetration and leakage due to poor fit. Materials \u0026 methods: A synthetic aerosol is introduced into the lung of a medical dummy. A conical laser sheet surrounds the face of the dummy w"}