PubMed:32102777 / 1517-1524
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T237","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok270","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}