<http://ns.inria.fr/covid19/PMC7127452#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC7127452#body_text>	<http://purl.org/dc/terms/subject>	"Military association football clubs in North Korea" .
<http://ns.inria.fr/covid19/PMC7127452#body_text>	<http://purl.org/dc/terms/subject>	"Microsoft criticisms and controversies" .