PMC:7650537 / 19563-19638 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T163","span":{"begin":23,"end":24},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T164","span":{"begin":45,"end":48},"obj":"http://purl.obolibrary.org/obo/CLO_0051582"}],"text":"To our knowledge, such a comprehensive study has not been conducted before."}

{"project":"LitCovid-sentences","denotations":[{"id":"T158","span":{"begin":0,"end":75},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"To our knowledge, such a comprehensive study has not been conducted before."}