PubMed:32118391 / 650-660
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T107","span":{"begin":0,"end":10},"obj":"JJ"}],"text":"stratified"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok115","span":{"begin":0,"end":10},"obj":"JJ"}],"text":"stratified"}