PubMed:32113196 / 199-201
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T33","span":{"begin":0,"end":2},"obj":"CD"}],"text":"15"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok36","span":{"begin":0,"end":2},"obj":"CD"}],"text":"15"}