PubMed:31991628 / 575-583
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T106","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"untraced"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok113","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"untraced"}