<http://ns.inria.fr/covid19/PMC7319747#title>	<http://purl.org/dc/terms/subject>	"1776 establishments in the United States" .
<http://ns.inria.fr/covid19/PMC7319747#title>	<http://purl.org/dc/terms/subject>	"Emergency medicine" .
<http://ns.inria.fr/covid19/PMC7319747#title>	<http://purl.org/dc/terms/subject>	"United States" .