PubMed:32149773 / 1691-1692
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T270","span":{"begin":0,"end":1},"obj":"CD"}],"text":"2"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok295","span":{"begin":0,"end":1},"obj":"CD"}],"text":"2"}