PMC:7696151 / 5348-5615 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T46","span":{"begin":69,"end":225},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" and were considered only one at a time, resulting in 2463 articles. After the primary screening based on titles and abstracts, 959 manuscripts were excluded since they did not fulfil the inclusion criteria or were off-topic. Finally, 1504 articles were thoroughly an"}