PubMed:32108351 / 399-406
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T58","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok69","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}