PubMed:32007152 / 34-41
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T4","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"lessons"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok7","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"lessons"}