PMC:7597510 / 1014-1024
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T10","span":{"begin":0,"end":10},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"BACKGROUND"}