PubMed:32056235 / 271-278
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T44","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok49","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"studies"}