<http://ns.inria.fr/covid19/PMC7104604#body_text>	<http://purl.org/dc/terms/subject>	"Air quality index" .
<http://ns.inria.fr/covid19/PMC7104604#body_text>	<http://purl.org/dc/terms/subject>	"Clinical research" .
<http://ns.inria.fr/covid19/PMC7104604#body_text>	<http://purl.org/dc/terms/subject>	"Evaluation methods" .