PMC:7796329 / 2398-2568 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T21","span":{"begin":33,"end":45},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"not act alone in killing John F. Kennedy [4]. Stempel et al. [5] reported that nearly one-third of American respondents accepted the theory that federal officials either "}