PubMed:32164424 / 1574-1580
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T231","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"trials"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok263","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"trials"}