<http://ns.inria.fr/covid19/PMC7194295#body_text>	<http://purl.org/dc/terms/subject>	"Cryogenian first appearances" .
<http://ns.inria.fr/covid19/PMC7194295#body_text>	<http://purl.org/dc/terms/subject>	"G20 nations" .
<http://ns.inria.fr/covid19/PMC7194295#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .