PubMed:32105632 / 118-131
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T19","span":{"begin":0,"end":13},"obj":"JJ"}],"text":"retrospective"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok21","span":{"begin":0,"end":13},"obj":"NN"}],"text":"retrospective"}