PubMed:32176772 / 1295-1301
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T277","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok322","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"levels"}