PubMed:31996494 / 135-141
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T26","span":{"begin":3,"end":4},"obj":"-LRB-"}],"text":"us (20"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok34","span":{"begin":3,"end":4},"obj":"("}],"text":"us (20"}