PubMed:32077115 / 216-220
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T33","span":{"begin":0,"end":4},"obj":"VBN"}],"text":"been"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok38","span":{"begin":0,"end":4},"obj":"VBN"}],"text":"been"}