PubMed:32077659 / 621-628
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T96","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok104","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}