PubMed:32167524 / 817-819
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T130","span":{"begin":0,"end":2},"obj":"CD"}],"text":"13"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok140","span":{"begin":0,"end":2},"obj":"CD"}],"text":"13"}