<http://ns.inria.fr/covid19/PMC4994343#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC4994343#body_text>	<http://purl.org/dc/terms/subject>	"British black-and-white films" .
<http://ns.inria.fr/covid19/PMC4994343#body_text>	<http://purl.org/dc/terms/subject>	"Arabian Peninsula" .