PubMed:31986264 / 881-890
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T128","span":{"begin":0,"end":9},"obj":"VB"}],"text":"ascertain"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok141","span":{"begin":0,"end":9},"obj":"VB"},{"id":"event13","span":{"begin":0,"end":9},"obj":"OCCURRENCE"}],"text":"ascertain"}