PubMed:32023682 / 16-26
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T4","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"challenges"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok7","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"challenges"}