PMC:7795972 / 9773-9911 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T78","span":{"begin":8,"end":95},"obj":"Sentence"},{"id":"T79","span":{"begin":97,"end":99},"obj":"Sentence"},{"id":"T80","span":{"begin":100,"end":107},"obj":"Sentence"},{"id":"T81","span":{"begin":109,"end":113},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ssured. The study conforms with the ethical principles outlined in the Declaration of Helsinki.\n\n3. Results\n\n3.1. Demographic Characterist"}