PubMed:32077115 / 2001-2008
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T342","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok408","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"factors"}