<http://ns.inria.fr/covid19/PMC7256909#title>	<http://purl.org/dc/terms/subject>	"Southern European countries" .
<http://ns.inria.fr/covid19/PMC7256909#title>	<http://purl.org/dc/terms/subject>	"Surgical specialties" .
<http://ns.inria.fr/covid19/PMC7256909#title>	<http://purl.org/dc/terms/subject>	"Countries in Europe" .