PMC:7696151 / 5181-5959 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T44","span":{"begin":0,"end":100},"obj":"Sentence"},{"id":"T45","span":{"begin":101,"end":235},"obj":"Sentence"},{"id":"T46","span":{"begin":236,"end":392},"obj":"Sentence"},{"id":"T47","span":{"begin":393,"end":477},"obj":"Sentence"},{"id":"T48","span":{"begin":478,"end":642},"obj":"Sentence"},{"id":"T49","span":{"begin":643,"end":698},"obj":"Sentence"},{"id":"T50","span":{"begin":699,"end":778},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The initial survey of the literature identified 2756 reports (2066 from Scopus and 690 from PubMed). Then, 293 the duplicates between the two databases were eliminated 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 analyzed and among these, 1442 were excluded. The analysis of the reference lists from some selected items led to the inclusion of an extra 71 appropriate articles, after titles, abstracts, and full-text study. In total, 133 papers were selected for data extraction. A flowchart illustrating the steps of the study selection is shown in Figure 2."}