PMC:7281378 / 9049-9274 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T61","span":{"begin":3,"end":128},"obj":"Sentence"},{"id":"T62","span":{"begin":129,"end":205},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"s. Occasionally, the full-text articles were also requested from the authors, if the full-text article was not available online. Two publications which could not be accessed were omitted from the analysis. Search results yiel"}