PMC:7784787 / 657-880 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T12","span":{"begin":57,"end":129},"obj":"Sentence"},{"id":"T13","span":{"begin":131,"end":149},"obj":"Sentence"},{"id":"T14","span":{"begin":151,"end":169},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"he mask fabric and leakage around the edges of the mask. A large variation in both material penetration and leakage was observed.\n\nGraphical abstract\n\nTweetable abstract\nFace masks are an effective means of stemming the spr"}