<http://ns.inria.fr/covid19/PMC7224593#body_text>	<http://purl.org/dc/terms/subject>	"Diseases and disorders" .
<http://ns.inria.fr/covid19/PMC7224593#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC7224593#body_text>	<http://purl.org/dc/terms/subject>	"Opioids" .