PMC:7279430 / 21110-21245 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T141","span":{"begin":16,"end":20},"obj":"Sentence"},{"id":"T142","span":{"begin":21,"end":50},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ls and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed,"}