<http://ns.inria.fr/covid19/PMC4459823#body_text>	<http://purl.org/dc/terms/subject>	"Centers for Disease Control and Prevention" .
<http://ns.inria.fr/covid19/PMC4459823#body_text>	<http://purl.org/dc/terms/subject>	"Data mining" .
<http://ns.inria.fr/covid19/PMC4459823#body_text>	<http://purl.org/dc/terms/subject>	"Trade unions" .