PubMed:31995857 / 175-183
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T28","span":{"begin":0,"end":8},"obj":"VBD"}],"text":"occurred"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok34","span":{"begin":0,"end":8},"obj":"VBD"},{"id":"event11","span":{"begin":0,"end":8},"obj":"OCCURRENCE"}],"text":"occurred"}