PMC:7696151 / 5867-5969 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T50","span":{"begin":13,"end":92},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" extraction. A flowchart illustrating the steps of the study selection is shown in Figure 2.\nIn our re"}