PMC:7417187 / 24377-24516 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T217","span":{"begin":0,"end":77},"obj":"Sentence"},{"id":"T218","span":{"begin":78,"end":119},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The masks are issued to the same user only after the fifth day of submission. Each mask is used maximum for five times. Subsequently, the m"}