PMC:7781500 / 17465-17561 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T189","span":{"begin":0,"end":96},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"But the actual protection level is still unknown, and it is to be established by larger studies."}