PMC:7796344 / 28487-28506
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T227","span":{"begin":0,"end":19},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"⮚ Primary/secondary"}