<http://ns.inria.fr/covid19/PMC3843553#body_text>	<http://purl.org/dc/terms/subject>	"Commercial-free television networks" .
<http://ns.inria.fr/covid19/PMC3843553#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC3843553#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .