PMC:7212965 / 9515-9774 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T62","span":{"begin":9,"end":133},"obj":"Sentence"},{"id":"T63","span":{"begin":135,"end":170},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ication. For studies from the United States, we continued to monitor major journals for additional publications until April 19, 2020.\n\nStudy Selection and Data Extraction\nIndependent screening of titles and abstracts was performed by independent reviewers (P."}