PMC:7781500 / 13666-13701
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T159","span":{"begin":0,"end":35},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" Frequency \u003c 0.001 "}