<http://ns.inria.fr/covid19/PMC7326622#title>	<http://purl.org/dc/terms/subject>	"Southern European countries" .
<http://ns.inria.fr/covid19/PMC7326622#title>	<http://purl.org/dc/terms/subject>	"Clinical research" .
<http://ns.inria.fr/covid19/PMC7326622#title>	<http://purl.org/dc/terms/subject>	"Hospitals" .