PubMed:33012350 / 1818-1956 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T6","span":{"begin":68,"end":69},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"More layers, 3 or 4, will provide increased filtration but there is a trade-off in that more layers increases the resistance to breathing."}

{"project":"LitCovid-PD-GO-BP","denotations":[{"id":"T2","span":{"begin":128,"end":137},"obj":"http://purl.obolibrary.org/obo/GO_0007585"}],"text":"More layers, 3 or 4, will provide increased filtration but there is a trade-off in that more layers increases the resistance to breathing."}

{"project":"LitCovid-sentences","denotations":[{"id":"T16","span":{"begin":0,"end":138},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"More layers, 3 or 4, will provide increased filtration but there is a trade-off in that more layers increases the resistance to breathing."}