PubMed:32133152 / 1561-1567
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T229","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok270","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}