PubMed:32133830 / 1156-1158
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T203","span":{"begin":0,"end":2},"obj":"CD"}],"text":"40"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok230","span":{"begin":0,"end":2},"obj":"CD"}],"text":"40"}