PMC:7795931 / 34910-35015 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T219","span":{"begin":0,"end":105},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Therefore, blocking can neither be too stringent nor too liberal, an optimal one usually lies in between."}