PubMed:32243945 / 321-325
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok59","span":{"begin":0,"end":4},"obj":"CD"},{"id":"lookup5","span":{"begin":0,"end":4},"obj":"time"},{"id":"lookup6","span":{"begin":0,"end":4},"obj":"number"}],"text":"four"}