PubMed:32088679 / 545-550
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T91","span":{"begin":0,"end":5},"obj":"VBN"}],"text":"known"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok101","span":{"begin":0,"end":5},"obj":"VBN"}],"text":"known"}