PubMed:32235085 / 73-76
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok14","span":{"begin":0,"end":2},"obj":"CD"}],"text":"18 "}
LitCovid-PD-CLO
{"project":"LitCovid-PD-CLO","denotations":[{"id":"T1","span":{"begin":0,"end":2},"obj":"http://purl.obolibrary.org/obo/CLO_0050510"}],"text":"18 "}