PMC:7386785 / 105849-105951 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T1213","span":{"begin":0,"end":102},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Could the reference standard, its conduct, or its interpretation have introduced bias?   Low risk  "}