PMC:7665480 / 12444-12487 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T159","span":{"begin":0,"end":43},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Extracorporeal life support was never used."}