<http://ns.inria.fr/covid19/PMC7122326#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC7122326#body_text>	<http://purl.org/dc/terms/subject>	"Centers for Disease Control and Prevention" .
<http://ns.inria.fr/covid19/PMC7122326#body_text>	<http://purl.org/dc/terms/subject>	"HD DVD" .