<http://ns.inria.fr/covid19/PMC7187839#body_text>	<http://purl.org/dc/terms/subject>	"Clinical research" .
<http://ns.inria.fr/covid19/PMC7187839#body_text>	<http://purl.org/dc/terms/subject>	"Europe" .
<http://ns.inria.fr/covid19/PMC7187839#body_text>	<http://purl.org/dc/terms/subject>	"Centers for Disease Control and Prevention" .