PubMed:32141569 / 279-284
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T54","span":{"begin":0,"end":5},"obj":"VBN"}],"text":"known"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok60","span":{"begin":0,"end":5},"obj":"VBN"},{"id":"event12","span":{"begin":0,"end":5},"obj":"OCCURRENCE"}],"text":"known"}