PMC:7784824 / 7022-7138 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T77","span":{"begin":0,"end":116},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Data on the validation and comparison of the performance of these assays are emerging but are still limited [15–18]."}