<http://ns.inria.fr/covid19/PMC7209973#body_text>	<http://purl.org/dc/terms/subject>	"The Four Greats" .
<http://ns.inria.fr/covid19/PMC7209973#body_text>	<http://purl.org/dc/terms/subject>	"Europe" .
<http://ns.inria.fr/covid19/PMC7209973#body_text>	<http://purl.org/dc/terms/subject>	"Southern European countries" .