<http://ns.inria.fr/covid19/PMC4109264#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC4109264#body_text>	<http://purl.org/dc/terms/subject>	"Lists of countries" .
<http://ns.inria.fr/covid19/PMC4109264#body_text>	<http://purl.org/dc/terms/subject>	"Molecular biology" .
<http://ns.inria.fr/covid19/PMC4109264#body_text>	<http://purl.org/dc/terms/subject>	"Medical mnemonics" .