PubMed:32172546 / 886-894
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T144","span":{"begin":0,"end":8},"obj":"VBN"}],"text":"observed"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok160","span":{"begin":0,"end":8},"obj":"VBN"},{"id":"event20","span":{"begin":0,"end":8},"obj":"OCCURRENCE"}],"text":"observed"}