<http://ns.inria.fr/covid19/PMC6145877#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC6145877#body_text>	<http://purl.org/dc/terms/subject>	"Lists of countries" .
<http://ns.inria.fr/covid19/PMC6145877#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .