PMC:7675688 / 206-333 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T6","span":{"begin":24,"end":31},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"rew of 4779 personnel.\n\nMethods\nWe obtained clinical and demographic data for all crew members, including results of testing by"}