PubMed:32150618 / 1731-1734
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T263","span":{"begin":0,"end":3},"obj":"CD"}],"text":"500"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok290","span":{"begin":0,"end":3},"obj":"CD"}],"text":"500"}