PMC:7543325 / 22210-22392 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T183","span":{"begin":11,"end":14},"obj":"http://purl.obolibrary.org/obo/CLO_0051582"},{"id":"T184","span":{"begin":124,"end":131},"obj":"http://purl.obolibrary.org/obo/UBERON_0000473"}],"text":"This study has several limitations: the small sample size, the retrospective nature of the study and the limited diagnostic testing available during the early period of the pandemic."}

{"project":"LitCovid-sentences","denotations":[{"id":"T214","span":{"begin":0,"end":182},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"This study has several limitations: the small sample size, the retrospective nature of the study and the limited diagnostic testing available during the early period of the pandemic."}