PubMed:32105632 / 2086-2094
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T408","span":{"begin":0,"end":8},"obj":"VBD"}],"text":"required"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok450","span":{"begin":0,"end":8},"obj":"VBD"},{"id":"event2","span":{"begin":0,"end":8},"obj":"OCCURRENCE"}],"text":"required"}