<http://ns.inria.fr/covid19/PMC7199767#body_text>	<http://purl.org/dc/terms/subject>	"Medical masks" .
<http://ns.inria.fr/covid19/PMC7199767#body_text>	<http://purl.org/dc/terms/subject>	"Primary care" .
<http://ns.inria.fr/covid19/PMC7199767#body_text>	<http://purl.org/dc/terms/subject>	"Centers for Disease Control and Prevention" .