PubMed:32118639 / 783-798
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T123","span":{"begin":0,"end":15},"obj":"RB"}],"text":"retrospectively"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok132","span":{"begin":0,"end":15},"obj":"RB"}],"text":"retrospectively"}