PMC:7795931 / 6733-6884 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T39","span":{"begin":0,"end":151},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"For information blocking, studies have been conducted in theoretical [39,40,41], in empirical [42,43], in case studies [43,44], and other perspectives."}