PMC:7461420 / 31719-31721
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T294","span":{"begin":0,"end":2},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"15"}