PubMed:32023685 / 948-954
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T149","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"trials"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok166","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"trials"}