PubMed:31995857 / 906-908
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T149","span":{"begin":0,"end":2},"obj":"CD"}],"text":"55"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok161","span":{"begin":0,"end":2},"obj":"CD"}],"text":"55"}