PubMed:31996494 / 218-220
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T42","span":{"begin":0,"end":2},"obj":"IN"}],"text":"At"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok53","span":{"begin":0,"end":2},"obj":"IN"}],"text":"At"}