PMC:7386785 / 39334-39381
Annnotations
LitCovid-PD-CLO
{"project":"LitCovid-PD-CLO","denotations":[{"id":"T14318","span":{"begin":25,"end":26},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"Did all patients receive a reference standard? "}
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T387","span":{"begin":0,"end":46},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Did all patients receive a reference standard? "}