_:b56438861	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b56438860	<http://www.w3.org/ns/oa#hasSelector>	_:b56438861 .
_:b56438861	<http://www.w3.org/ns/oa#exact>	"concentrations" .
_:b56438860	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/ffe7b1544ed9e8e4b2206bdd3c474e9e19085991/2> .