PubMed:31995857 / 1493-1501
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T274","span":{"begin":0,"end":8},"obj":"VBN"}],"text":"occurred"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok311","span":{"begin":0,"end":8},"obj":"VBN"},{"id":"event18","span":{"begin":0,"end":8},"obj":"OCCURRENCE"}],"text":"occurred"}