PubMed:31996494 / 14-24
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T2","span":{"begin":1,"end":8},"obj":"NNS"}],"text":" options f"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok3","span":{"begin":1,"end":8},"obj":"NNS"}],"text":" options f"}