PubMed:32167524 / 311-318
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T49","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok53","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}