PubMed:32062875 / 1644-1650
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T297","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok329","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}