PubMed:31996494 / 172-174
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T33","span":{"begin":0,"end":2},"obj":"CD"}],"text":"25"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok43","span":{"begin":0,"end":2},"obj":"CD"}],"text":"25"}