PMC:7341464 / 426-547 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T4","span":{"begin":81,"end":82},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"Unfortunately, in this retrospective study, follow-up data were not provided and a direct control group was not included."}

{"project":"LitCovid-PD-CHEBI","denotations":[{"id":"T2","span":{"begin":98,"end":103},"obj":"Chemical"}],"attributes":[{"id":"A2","pred":"chebi_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/CHEBI_24433"}],"text":"Unfortunately, in this retrospective study, follow-up data were not provided and a direct control group was not included."}

{"project":"LitCovid-sentences","denotations":[{"id":"T6","span":{"begin":0,"end":121},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Unfortunately, in this retrospective study, follow-up data were not provided and a direct control group was not included."}