PubMed:32164400 / 633-641
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T109","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"clusters"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok130","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"clusters"}