PMC:7067204 / 1699-1711
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T18","span":{"begin":0,"end":12},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Introduction"}