PubMed:32164424 / 1268-1275
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T186","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok213","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}