<http://ns.inria.fr/covid19/PMC7190008#title>	<http://purl.org/dc/terms/subject>	"National Health Service" .
<http://ns.inria.fr/covid19/PMC7190008#title>	<http://purl.org/dc/terms/subject>	"Metropolitan areas of China" .
<http://ns.inria.fr/covid19/PMC7190008#title>	<http://purl.org/dc/terms/subject>	"10th-century establishments in China" .