<http://ns.inria.fr/covid19/PMC7383062#body_text>	<http://purl.org/dc/terms/subject>	"Commercial-free television networks" .
<http://ns.inria.fr/covid19/PMC7383062#body_text>	<http://purl.org/dc/terms/subject>	"Medical mnemonics" .
<http://ns.inria.fr/covid19/PMC7383062#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .