PubMed:32083728 / 567-577
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T92","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"challenges"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok97","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"challenges"}