PubMed:31991628 / 674-682
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T121","span":{"begin":0,"end":8},"obj":"VBN"}],"text":"occurred"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok128","span":{"begin":0,"end":8},"obj":"VBN"},{"id":"event2","span":{"begin":0,"end":8},"obj":"OCCURRENCE"}],"text":"occurred"}