<http://ns.inria.fr/covid19/PMC4171353#body_text>	<http://purl.org/dc/terms/subject>	"History of Manchuria" .
<http://ns.inria.fr/covid19/PMC4171353#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC4171353#body_text>	<http://purl.org/dc/terms/subject>	"Pleistocene" .