PubMed:32243238 / 1777-1779 JSONTXT

{"project":"LitCovid-TimeML","denotations":[{"id":"tok387","span":{"begin":0,"end":2},"obj":"CD"}],"text":"53"}

{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N7","span":{"begin":0,"end":2},"obj":"num"}],"text":"53"}