PMC:7417187 / 15433-15495
Annnotations
LitCovid-PD-CLO
{"project":"LitCovid-PD-CLO","denotations":[{"id":"T100","span":{"begin":2,"end":3},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"r a triple-layer surgical mask in the postoperative period. Ov"}