PMC:7294857 / 16817-16904 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T143","span":{"begin":0,"end":87},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The study showed there are four stages in the disease progression based on CT findings."}