<http://ns.inria.fr/covid19/PMC4821614#body_text>	<http://purl.org/dc/terms/subject>	"Abdominal pain" .
<http://ns.inria.fr/covid19/PMC4821614#body_text>	<http://purl.org/dc/terms/subject>	"Populated places on Lake Ontario in Canada" .
<http://ns.inria.fr/covid19/PMC4821614#body_text>	<http://purl.org/dc/terms/subject>	"Contingency table" .