PubMed:32105632 / 551-564
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T85","span":{"begin":0,"end":13},"obj":"JJ"}],"text":"observational"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok94","span":{"begin":0,"end":13},"obj":"NN"}],"text":"observational"}